United States

Department of

Agriculture

Forest Service

Pacific Northwest

Research Station

General Technical

Report

PNW-GTR-623

December 2004

Economic Assessment of

Using a Mobile Micromill®

for Processing SmallDiameter Ponderosa Pine

Dennis R. Becker, Evan E. Hjerpe, and Eini C. Lowell
The Forest Service of the U.S. Department of Agriculture is dedicated to the principle of

multiple use management of the Nation’s forest resources for sustained yields of wood,

water, forage, wildlife, and recreation. Through forestry research, cooperation with the

States and private forest owners, and management of the National Forests and National

Grasslands, it strives—as directed by Congress—to provide increasingly greater service to

a growing Nation.

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call (202) 720-5964 (voice and TDD). USDA is an equal opportunity provider and employer.

USDA is committed to making the information materials accessible to all USDA customers

and employees

Authors

Dennis R. Becker is a research forester, U.S. Department of Agriculture, Forest

Service, Pacific Northwest Research Station. He is located at Rocky Mountain

Research Station, 2500 S Pine Knoll Drive, Flagstaff, AZ 86001-5018; Evan E.

Hjerpe is a Ph.D. student at Northern Arizona University, School of Forestry,

110 E Pine Knoll Drive, Flagstaff, AZ 86011-5018; and Eini C. Lowell is a

research scientist, U.S. Department of Agriculture, Forest Service, Pacific

Northwest Research Station, 620 SW Main, Suite 400, Portland, OR 97205.

Photo credit

Cover photo by Dean Parry
Abstract

Becker, Dennis R.; Hjerpe, Evan E.; Lowell, Eini C. 2004. Economic assessment of using a mobile Micromill® for processing small-diameter ponderosa

pine. Gen. Tech. Rep. PNW-GTR-623. Portland, OR: U.S. Department of

Agriculture, Forest Service, Pacific Northwest Research Station. 40 p.

An economic assessment of an SLP5000 Diesel Micromill® was conducted to

determine the maintenance and operation costs and the logistics of a mobile sawmill used to process small-diameter ponderosa pine. The Micromill® was first

introduced in 1997 and has since received considerable attention. In 2003, the

USDA Forest Service, Pacific Northwest Research Station conducted a detailed

financial analysis of a Micromill® in Escalante, Utah. Productive and nonproductive time was recorded, and the feasibility and logistics of periodically moving the

mill closer to the raw material source were assessed in terms of delivered log costs

and mobilization costs. Product volume and grade recovery were collected to

examine market options. Results of the analysis indicate that cashflow, support

equipment, delivered log costs, and product markets significantly affect the financial viability of a mobile Micromill® enterprise.

Keywords: Small-diameter ponderosa pine utilization (Southwest), economic

assessment, small-log mobile processing.
Contents

1 Introduction

2 Mobile Processing of Small-Diameter Logs

4 Project Description

5 Method

7 Fixed Costs

7 Financing—Micromill

8 Financing—Support Equipment

10 Mill Siting

12 Variable Costs

12 Operation and Maintenance—Micromill

14 Operation and Maintenance—Support Equipment

16 Labor Requirements

19 Delivered Raw Logs Costs and Inventory

20 Relocation Costs and Equipment Setup

20 Logistics and Per-Move Costs

21 Market Return

22 Mill Productivity

22 Grade Recovery

23 Market Options

26 Annual Costs and Break-Even Analysis

28 Market Scenarios

33 Discussion

33 Cashflow Requirements

34 Key Factors Affecting Profitability

36 Conclusion

37 Metric Equivalents

37 Literature Cited
1

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Introduction

Current wood markets limit the economic feasibility of both purchasing and

hauling small-diameter ponderosa pine (Pinus ponderosa Dougl. ex Laws.) to

existing sawmills in the Western United States owing to the low value and low

recovery of merchantable products from the resource. Previous efforts to use smalldiameter ponderosa pine have been successful because of favorable pulpwood

markets and an ability to offset costs with the processing of larger diameter trees

(greater than 12 in diameter at breast height [d.b.h.]). Presently, markets for pulpwood in the West are scarce, and the ability to offset harvesting and hauling costs

with large-diameter trees is limited by reductions in timber harvests from the

national forests (Haynes and Fight 2004). This, combined with years of fire suppression, has left an overabundance of small-diameter ponderosa pine (12 in d.b.h.

or smaller) in the Southwest (Covington and Moore 1994). The need to identify and

invest in endeavors that offset the cost of harvesting and processing this smalldiameter material is underscored by increased threats of catastrophic wildfire

brought on by recent drought conditions and outbreaks of insects and diseases in

the region.

The Micromill® is one example of small-diameter wood-processing technology

receiving attention. To facilitate sound investment in processing technology, an

economic assessment was conducted on the SLP5000 Diesel Micromill® (hereafter

Micromill) to identify major costs, operational barriers, and market opportunities

for processed material.1 The Micromill is a 300-horsepower dimension sawmill

capable of processing 4- to 20-ft logs with a maximum large-end diameter (outside

bark) of 13 in and a minimum small-end diameter (outside bark) of 4 in. Designed

to cut about 850,000 to 3,500,000 ft3

 per year, depending on tree species and desired product, the mill produces four-sided cants, rough-cut lumber, and chips in a

single-pass, automatic-feed system (fig. 1). The diesel model is built in a standardsized shipping container to facilitate mobility (fig. 2). The operation is independent

of utilities and major infrastructure, which allows it to be located to take advantage

of temporary opportunities for fiber such as in insect-damaged and -killed stands,

burned areas, and thinning operations. The mill is also suited to operate as a satellite to a large mill by processing logs into finished products or into cants for further

processing. Various lumber sizes and cutting patterns can be achieved with the

basic configuration (Micromill Systems 2003).

1 The use of trade or firm names in this publication is for reader information and does not

imply endorsement by the U.S. Department of Agriculture of any product or service.

The Micromill®, a

300-horsepower

dimension sawmill

capable of processing

4- to 20-ft logs with a

maximum large-end

diameter (outside

bark) of 13 in and a

minimum small-end

diameter (outside

bark) of 4 in is one

example of smalldiameter woodprocessing

technology.
GENERAL TECHNICAL REPORT PNW-GTR-623

2

Figure 1—One-pass system of Micromill log processing

(Illustration courtesy of Micromill Systems, Inc.).

Figure 2—SLP5000 Diesel Micromill® processing small-diameter ponderosa pine (Photo by Dean Parry).

Mobile Processing of Small-Diameter Logs

In many regions of the Western United States, the costs associated with the transport of small raw logs are prohibitive because of diminished solid wood and

biomass processing capacity necessitating long haul distances to manufacturing

facilities (Han et al. 2002, Keegan et al. 2001, Lynch 2001, USDA Forest Service

2003). Finding suitable markets for small-diameter logs is further complicated by

physical characteristics and product suitability of such wood (Spelter et al. 1996).

In the Southwest, for instance, small-diameter ponderosa pine is characterized by

suppressed growth with reduced strength properties (Larson and Mirth 1999) and
3

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

poor drying characteristics (Argenbright et al. 1978, Simpson and Green 2001,

Voorhies and Blake 1981) making it a poor choice for production of dimension

lumber where strength is key. The ability to develop value-added products by

using small-diameter ponderosa pine is in part contingent on the ability of finished

products to compete in the marketplace. Transportation and processing costs need

to be minimized to make processing small-diameter logs more competitive.

The capacity and technology to efficiently process small-diameter logs is

highly variable in the Western United States. In some regions, new processing

technology to handle large volumes of small logs exists. In other regions, like the

Southwest, manufacturing facilities are few, making the costs associated with

transporting small logs to existing facilities significant and often cost prohibitive.

Mobile processing technology is one option to reduce transportation costs. The

Micromill in particular, provides a low-cost alternative to capital-intensive investments associated with stationary, small-log processing mills. Mobile processing

technology allows for flexibility where the availability of resource supply is

inconsistent, unreliable, or where the cost of transporting logs to a stationary mill

is cost prohibitive. Integrating mobile processing operations with quality end

products can potentially offset the associated costs of harvesting, processing, and

handling products made from small-diameter ponderosa pine (fig. 3). It also has

the potential to address the growing need to economically remove an abundance

of small-diameter trees from Western forests and thereby reduce the risk of catastrophic wildfire.

Figure 3—Vertical integration of mobile sawmill product options.

The ability to develop

value-added products

by using smalldiameter ponderosa

pine is in part contingent on the ability of

finished products to

compete in the

marketplace.
GENERAL TECHNICAL REPORT PNW-GTR-623

4

There are several factors to consider when investing in a mobile processing

operation. This study organizes them into three categories: mill specifications,

resource characteristics, and harvest systems. Mill specifications include common

considerations like price, daily production rates, saw speed, operation and maintenance costs, and transportability (Bratkovich 2003). Less obvious but important

considerations are resource characteristics. Barbour and colleagues (Barbour et al.

2003, Lowell and Barbour 2002) cite the physical characteristics of the forest

resource as one of the fundamental determinants of product application in the

utilization of small-diameter ponderosa pine. For instance, tree height, growth rate,

knot size and number, and other physical traits dictate the product markets available to the producer. Therefore, unless products are being produced for personal

use, producers will need to understand current and expected retail and wholesale

markets. Harvest systems are another less obvious but important consideration.

Distance to the resource base, harvest season and operability, required log inventory, projected harvest volumes and management prescriptions, and other constraints such as contract specifications and log measurements influence profitability of a mobile operation (Swan 2003). Each factor influences decisions about

the types of processing options feasible. Mill specifications, resource characteristics, and harvest systems are all addressed in the following analyses.

Project Description

Several manufacturers build mobile mills that process small-diameter logs, including but not limited to, Scragg®, Wood-Mizer®, Mobile Dimension®, TimberKing®,

and Economizer® (earlier version of the current Micromill). These systems use

band, swing, or circular saws and are made for the individual craftsman and parttime logger or for commercial production. The Micromill was chosen for this

analysis because of ongoing research by the authors on volume and grade recovery

from small-diameter ponderosa pine in northern Arizona processed by using an

SLP5000D Micromill. In that research, logs were shipped to Skyline Forest

Resources in Escalante, Utah, who purchased a Micromill in 2001 with financial

assistance from community partners and grants from the USDA Forest Service. The

Micromill has since received considerable attention in the Southwest for its ability

to efficiently process small-diameter logs. As a result of this research and interest

in monitoring financial investments, community partners requested an expanded

analysis of the Micromill operation. Community partners include the Greater

Flagstaff Forests Partnership, Escalante Heritage Center, Forest Trust, and FourCorners Sustainable Forests Partnership.

Factors to consider

when investing in

mobile processing

include mill specifications, resource

characteristics, and

harvest systems.
5

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Initially, funding was provided by the Joint Fire Science Program as part of the

National Fire Plan to evaluate opportunities to lower costs of fire-risk-reduction

treatments. With this funding, the USDA Forest Service, Pacific Northwest (PNW)

Research Station was able to assess the economics of the Micromill given different

markets, mobility, and resource characteristics. Community partners were most

interested in the financial, technical, and logistical aspects of a mobile Micromill

for processing small-diameter ponderosa pine in the Four-Corners region of Utah,

Arizona, New Mexico, and Colorado. Financial considerations include capital

investment, cashflow, operation and maintenance costs, labor, delivered log costs,

and product markets. Technical considerations include raw material requirements

and volume and grade recovery of processed lumber. Logistical considerations

include mill siting, transportation costs, residue handling, and related issues. At the

request of community partners, the following questions were assessed:

• What are the fixed and variable costs associated with using a mobile

Micromill system?

• What are the break-even points in terms of production volumes and markets

for a mobile Micromill processing system to be economically feasible?

• Which costs most affect the economic viability of a mobile Micromill system?

• Which solid wood and biomass products are economically feasible for mobile

Micromill processing?

• What technical and logistical strategies are necessary to support production of

selected finished products?

The purpose of this study is to provide individuals, community partners, and

businesses with an analysis of Micromill operations to facilitate sound investment

in small-diameter wood processing capability. Detailed analyses are provided for

different scenarios selected to represent current market options for small-diameter

ponderosa pine in the Four-Corners region. Market scenarios, investment costs, and

operations costs are subject to change. Variability also exists in resource supply,

access, and contracting specifications within treatment prescriptions that will affect

profitability. It is the responsibility of those seeking to invest in a Micromill

enterprise to conduct an independent evaluation of logistics and economic feasibility (a business plan) based on their unique situation.

Method

Data were collected from various sources, both primary and secondary in nature.

Primary data were obtained from Micromill Systems, Inc., representatives, owners,

and operators of Micromill operations. Information was collected by observing
GENERAL TECHNICAL REPORT PNW-GTR-623

6

milling operations, conducting owner/operator interviews, reviewing of maintenance and operations records, and through phone and email correspondence.

Secondary data included information from the PNW Research Station, the Greater

Flagstaff Forests Partnership, and from other technical, peer-reviewed, and independent reports. Such reports facilitated the identification of information on mill

site preparation, product recovery, markets, and other variables of interest.

Multiple observational trips were taken to the existing Micromill operation

in Escalante, Utah. Skyline Forest Resources acquired the Micromill in 2001

as a satellite mill to their conventional sawmill to more efficiently process smalldiameter logs. Productivity rates were observed for ponderosa pine. Product

volume and grade recovery also were measured. The following are specifications

of the Micromill system as analyzed for this study:

Mill specifications Micromill model SLP5000D

Description Dimension, single pass

Base price (2003 U.S. dollars) $392,000

Processing capacity:

Log length 4 to 20 ft

Log diameter 4 to 13 in

Production capacity2 3,250 board feet/hour (softwood)

Number of employees for operations 3 to 4

Kerf 3 .161 in

A “least-cost” approach was utilized. The least-cost approach involves analyzing

several scenarios that could be used to achieve desired objectives and choosing the

scenario with the least cost incurred. Scenarios were selected based on observations of existing Micromill operations and included the range of likely fixed and

variable costs, and market conditions in the Four-Corners region. Fixed costs

included the purchase and financing of an SLP5000D Micromill, optional attachments, and support equipment. Other fixed costs include taxes, interest, opportunity costs, maintenance, and insurance. Variable costs assessed included those

associated with the operation and maintenance of a Micromill and its support

equipment, labor requirements, fuel consumption, mobilization costs and setup,

and costs of delivering and sorting raw logs.

2

 Production rates will differ depending on species of wood, length, diameter of logs, and

product specifications. Reported rate is from manufacturer specifications of board feet

processed per hour and do not include scheduled time for breaks and cleanup. Capacity is

shown for test runs of 6-in logs (outside bark at large end) for square cants 4-in in size.

3

 Kerf is the width of a saw cut.
7

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

An assessment of market options, market returns, and product volume and

grade recovery for small-diameter ponderosa pine is used to determine break-even

points and overall economic feasibility. An attempt was made to provide an accurate assessment of economic return (income) in the Four-Corners region. Owing to

the variability in markets, however, exact investment returns cannot be precisely

measured. Therefore, the following assumptions were used to guide the overall

analysis; specific assumptions are presented in each of the subsequent sections to

develop detailed cost estimates:

• Analyses are based on a consistent, available supply of timber resources.

• Cost analyses are based on the ability to secure financing at the expressed rate.

• Support equipment will be required for mobile processing in addition to

investment and operations costs for the Micromill.

• Labor requirements assume the local availability of skilled personnel.

• Economic returns are assessed for existing product markets by using smalldiameter ponderosa pine in the Four-Corners region.

Fixed Costs

Financing—Micromill

Assumption—

Financing costs are necessary to determine required monthly and annual cashflow

and to estimate economic return on investments. In addition to the initial purchase

of the Micromill SLP5000D, investment is required for optional equipment attachments for processing large volumes of ponderosa pine. Attachments and upgrades

available from Micromill Systems, Inc., include a 300-horsepower diesel engine,

heavy-duty log infeed, high-pressure hydraulic filter, engine block heater for winter

operations, and knife- and saw-sharpening system. Sales tax, freight costs, setup

costs, and interest also are included in the analysis. Assumptions used to calculate

mill financing include:

• Cost estimates are based on 2003 U.S. dollars.

• Interest rates are based on average 2003 rates.

• Financing is based on a 7-year (84-month) financing term.

• Investors are able to secure financing at the identified rate.

Costs—

Based on the above assumptions, the following tabulation provides a breakdown of

the costs associated with purchasing and financing a Micromill operation. Additional considerations for the purchase of support equipment, such as forklift and
GENERAL TECHNICAL REPORT PNW-GTR-623

8

front-end tractor-loader are addressed in a subsequent section. Financing costs for

the SLP5000D Micromill are as follows:

Financing item Cost

Dollars

Total equipment package (2003 U.S. dollars)4 426,185

Sales tax at 0 percent 0

Mill delivery, setup, and training 7,000

Total delivered equipment price 433,185

Downpayment (30 percent) 129,956

Financed amount 303,230

Monthly payment (84-month term at 7-percent interest) 5,884

Annual financing cost 70,609

Key issues—

The tabulation above provides the costs of equipment as of September 2003 and is

based on the purchase, delivery, setup, and training costs reported by Micromill

Systems, Inc. Based on a 7-year financing term and a 30-percent downpayment,

annual financing costs total $70,609. Capital outlay of approximately $130,000 is

required in year 1 for downpayment costs. Investors may require a different equipment package resulting in different financing costs. Flexibility exists in choosing

optional attachments and upgrades for specific locales and operations.

Financing–Support Equipment

Assumption—

In addition to the purchase of the mill, support equipment is required for log

sorting and handling of cants and finished products. The least-cost approach

assumes the purchase or lease of one small tractor-loader capable of handling logs

up to 20 ft long and 13 in in diameter on the large end (outside bark). The tractorloader also will be used for site preparation and cleanup. A 15,000-lb capacity

forklift is used to handle cants. The forklift will move pallets of cants, load finished

products, and provide support in moving equipment and site cleanup during mill

relocation. One heavy-duty maintenance pickup truck with a commercial toolbox

and fuel tank is also required to transport fuel, house tools, and provide transportation to and from the worksite for employees. In addition, a chain saw, storage bins

4

 Optional equipment for the Micromill SLP5000D includes a 300-horsepower diesel

engine, heavy-duty log infeed, high-pressure hydraulic filter, 130-gal fuel tank, basic tools

and cabinet, engine block heater, and Micromill knife- and saw-sharpening system.
9

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

to stack processed cants, and other small tools are required for routine operation

and maintenance. The system as analyzed does not include a debarker used to

remove bark, which can then be used for landscaping and related products.

Costs—

Financed amounts for support equipment reflect used equipment purchase prices

as reported for the 2003 third quarter in the Green Book (PRIMEDIA 2003). Other

support equipment not included in this analysis but required of contractors

includes:

• Self-loading semi-trucks for log delivery and unloading.

• Chip vans and semi-truck for removal of sawdust and chips.

• Semi-trucks for finished product pickup and delivery.

The availability of independent contractors to accomplish these tasks is assumed

adequate. Inability of contractors to provide self-loading log trucks would require

additional investment in a large front-end tractor-loader capable of unloading log

trucks.

Key issues—

Table 1 provides the costs of used support equipment as of fall 2003. Based on a

60-month financing term and a downpayment of 30 percent for the given equipment package, annual financing costs will exceed $16,000. The decision to purchase new equipment or to purchase a different equipment set could significantly

affect annual financing costs. In addition, financing costs are significantly affected

by the loan term and qualifying interest rate. Actual rates may be greater.

The least-cost approach assumed the use of a small tractor-loader for log sorting and other tasks as necessary. However, it may be feasible to purchase equipment designed specifically for log sorting. Log-sorting equipment will significantly

increase investment costs but can lead to increased mill productivity. Increased

productivity is achieved by more efficient and consistent sorting of similar-sized

logs resulting in improved merchandizing of finished products (Dramm et al.

2002). Over time, the addition of appropriate log-sorting equipment may improve

return on investment, but it also may complicate mobile processing.

A variety of equipment packages may be used in support of Micromill operations. If the mill is located as a satellite to a larger mill, it may not be necessary

to purchase additional equipment. However, mobile processing will require substantial investment in support equipment in addition to the mill itself. The choice

of equipment, purchase price, taxes, and financing will significantly affect profitability.
GENERAL TECHNICAL REPORT PNW-GTR-623

10

Mill Siting

Assumptions—

The geographic location of the Micromill is contingent upon several factors related

to transportation distance from the raw material source, cost of private or public

lease of the mill site, surfacing requirements, and physical barriers to log and

finished product storage. To minimize costs associated with mobilizing the mill to a

new location and associated lost production time, the least-cost approach assumes

the mill to be sited in a centralized location near the source of raw material but not

actually on the site of active logging. The maximum cost-effective distance of the

Micromill to the raw material source is highly dependent upon existing market

conditions, log supply, and delivered log costs. With approximately 50 percent of

small-log processing costs incurred in transportation and handling (Lynch 2001),

break-even analysis for saw logs between 5- and 12-in d.b.h. is often considered

less than 60 mi (Han et al. 2002). In cases where the mill will be stationary for an

entire harvest season, year-around site access is necessary for finished-product and

residual-waste handling. Other site requirements include:

• A minimum of 3 acres for the mill site with secondary road access.

• Space for raw log delivery, storage, truck turnaround, and finished products.

• Adequate water drainage and site surfacing for periods of inclement weather.

• A minimum of a 20- by 30-ft by 4-in concrete slab with anchors for the mill

sawbox.

Table 1–Costs associated with financing support equipment purchased used

Tractor- Maintenance Other

Financing item loadera

Forkliftb vehiclec equipmentd

Dollars

Total equipment packagee 20,000 40,000 15,000 1,792

Sales tax at 7.5 percent 1,500 3,000 1,125 134

Downpayment (30 percent) 6,450 12,900 4,838 0

Financed amount 15,050 30,100 11,287 0

Monthly paymentf 356 711 267 0

Annual financing cost 4,267 8,534 3,200 0

a One 65-horsepower tractor-loader with front-end bucket and grapple fork attachments.

b One 15,000-lb capacity forklift.

c One 2-ton pickup truck with maintenance toolbox and 100-gallon-storage fuel tank.

d Other required equipment includes one new chainsaw, two cant stackers for finished products,

stickers for air-drying, and one storage bin for wood slats.

e Equipment costs based on U.S. dollars as of September 2003.

f Based on a 60-month term at 7-percent interest.

The maximum costeffective distance of

the Micromill to the

raw material source

is highly dependent

upon existing market

conditions, log

supply, and delivered

log costs.
11

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

• A minimum of a 5- by 20-ft by 4-in concrete slab with anchors for raw log

infeed.

• A 4-in thick concrete slab (approximately 9 yd3

 total).

Cinder and rock pits on state and federal forest lands in the Four-Corners region

often provide adequate space and proximity to the raw material source for mill

siting. The availability of these and other sites is dependent upon associated laws

and regulations regarding temporary facilities and use on public lands. Private

industrial sites are also likely to provide many suitable locations.

Costs—

Based on the above assumptions, the following tabulation provides a breakdown of

the costs associated with mill siting. Additional considerations of move-in and

setup costs are addressed in a subsequent section. Specific costs for site preparation, road access, and cleanup are site-dependent. These cost considerations are

included here, but no specific amounts are given:

Siting items Site location

Concrete surfacing • $3,000 (9 yd3

 of concrete required for a 20- by 30-ft

and 5- by 20-ft, 4-in thick slab delivered within 50

mi of supplier; includes construction labor costs)

Site lease • Cost of site lease will differ depending on

landowner, acreage, and duration of lease

Road access • Secondary road access

• Culverts

• Road surfacing

Site preparation • Water drainage

• Site leveling and surfacing for seasonal conditions

• Raw log and finished product storage space

Water and dust abatement • Site surfacing

• Stream course protection

Site cleanup • Concrete slab removal

• Waste wood removal; cut for firewood and given

away

• Residual sawdust not collected for chips used in site

reclamation or hauled to landfill

Total annual site cost • Dependent on public or private landowner, acreage,

and lease duration
GENERAL TECHNICAL REPORT PNW-GTR-623

12

Key issues—

The cost of the Micromill siting is a one-time cost incurred each time the mill is

relocated. Additional costs related to site lease, road access, site preparation, water

and dust abatement, and site cleanup may be incurred depending on the duration of

site use and site-dependent characteristics. Cashflow requirements will include

monthly site lease, capital outlay for construction of concrete slabs, and other site

improvements as necessary.

Costs are based on the experience of existing Micromill owners. Depending on

the location of mill siting, lease costs may be minimal. For example, it may be

feasible to assume that the short-term siting of a mill on state or federal lands will

not require a site lease. Alternatively, the lease of private industrial lands may

require substantial investment depending on the duration of the site lease.

The lease and preparation of the mill site is an important consideration in the

economic viability of a mobile Micromill operation. Although capital outlay and

cashflow considerations are minor in relation to overall mill operations, distance

from the Micromill site to available sources of raw material and ability to access

and use the site during periods of inclement weather will significantly affect

productivity and ultimately, profitability. Delivered log costs will be prohibitive if

the location is too far from available resources. Periods of inclement weather will

affect the number of productive machine hours in a given year if the location

cannot accommodate incoming log trucks and outgoing delivery trucks and chip

vans.

Variable Costs

Operation and Maintenance—Micromill

Assumptions—

Operating costs assessed for the Micromill system entail a broad range of considerations. Maintenance of mill saw knives and blades, sawdust blower, in-feed and

out-feed decks, and diesel engine components is included. Operating costs related

to fuel and oil consumption, insurance and taxes, and equipment replacement are

assessed based on annual scheduled machine hours (SMHs). Also included are

annual investment costs of depreciation, salvage value amortized over the life of

the equipment, and opportunity cost.

Annual machine hours scheduled for the Micromill system are conservatively

assumed to be 1,600 hours, or about 9.5 months operation (40-hour workweek, 21

working days/month) for the Four-Corners area to account for seasonal operations

restrictions because of inclement weather (snow, monsoon rains) and periodic fire

closures of the forests. Periodic disruptions in operations are also likely for major
13

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

breakdowns and diminished log supply. It is assumed that the actual utilization rate

of the machinery during these 1,600 hours will be no more than 75 percent to

account for scheduled downtime for routine maintenance, cleanup, breaks, and

resetting of saws. The resulting 1,200 hours are used to calculate total productivity

(productive machine hours or PMH) and expected rates of return on investment.

Costs—

Based on the above assumptions, the following tabulation provides a breakdown

of operation and maintenance costs associated with the SLP5000D Micromill.

Sources of information for these figures were derived from manufacturer specifications (Micromill Systems 2003) and operation and maintenance records from

Skyline Forests Resources. Additional cost considerations for support equipment

are addressed in the following section. Annual operation and maintenance costs of

the Micromill include:

Operation and maintenance cost items Unit cost

Dollars

Annual depreciation5 44,800

Opportunity costs (8-percent interest on money invested) 20,608

Insurance and taxes 15,064

Maintenance and repairs6 44,800

Fuel consumption 14,580

Lube, oil, and filters 5,395

Knives and saws 5,229

Total annual operation and maintenance cost 150,476

Key issues—

The annual cost of operation and maintenance for the Micromill is highly dependent upon the number of PMH each year. More hours increase maintenance and

repair costs, fuel and oil consumption, and the rate at which chip knives and saw

blades require sharpening and replacement. However, an increase in PMH also

increases annual productivity, which will decrease the relative cost of depreciation,

insurance and taxes, and the opportunity cost of money invested. Return on investment will therefore be greater with an increase in PMH.

5

 Straight-line depreciation based on a 20-percent salvage value amortized over the

economic life (7 years) of the equipment.

6

 Maintenance and repair costs equal 100 percent of annual depreciation for economic life

of equipment.
GENERAL TECHNICAL REPORT PNW-GTR-623

14

Productive machine hours can be increased in several ways. Simply scheduling

more operating time per year will increase productive hours if there is an adequate

supply of raw material and unscheduled downtime is minimal. Unscheduled time

for inclement weather or natural occurrences such as forest fires is unavoidable in

the Four-Corners region. Unscheduled time for maintenance and repairs can be

minimized with routine preventative maintenance and adequate training of personnel. Furthermore, PMH can be increased, or at least held constant, if a continual

inventory of logs is presorted and ready for processing. Logs are generally sorted

into two to four size classes for the Micromill operation. Sorting based on product

merchandizing allows for maximum lumber recovery and minimal time spent

changing saw configuration. Onsite sorting for product merchandizing is addressed

in the following section on support equipment. The cost of in-woods sorting by

logging contractors is addressed in a subsequent section on delivered log costs.

The number of productive machine hours will not only significantly affect

operation and maintenance costs but will also determine the annual investment

costs and ultimate mill profitability. To maximize the number of productive hours

for each scheduled period of operation, it is imperative that mill owners and

operators have a good understanding of how to process different tree species and

have the ability to maximize product potential from each size of log with given

characteristics such as taper or amount of defect. Owners and operators will need

to adjust their schedules and PMH according to their unique circumstances.

Operation and Maintenance—Support Equipment

Assumptions—

In addition to the operation and maintenance of the mill itself, various support

equipment is necessary for efficient processing. As previously identified, the leastcost approach assumes the purchase of one small tractor-loader, forklift, heavyduty maintenance vehicle, and associated small equipment. Like operation and

maintenance costs for the Micromill, costs for the tractor-loader, forklift, and

maintenance vehicle are based on fuel and oil consumption, insurance and taxes,

and equipment replacement. Also included are annual investment costs of depreciation, salvage value amortized over the life of the equipment, and opportunity cost.

Annual machine hours scheduled for support equipment are assumed to be

1,600 hours based on a 40-hour workweek. The PMH of support equipment will

differ depending on the function of each piece of machinery. It is assumed that the

65-horsepower tractor-loader will be productively used for 1,200 hours per year,

or whenever the Micromill is in operation. Based on observations of the Skyline
15

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Forests Resources mill, the forklift and maintenance vehicle will be used less often

at a rate of approximately 800 and 400 PMH, respectively; the chain saw will be

used for approximately 240 PMH.

Costs—

Based on the above scenario, table 2 provides a breakdown of operation and maintenance costs associated with the identified equipment. Sources of information for

these figures are the 2003 third quarter in the Green Book (PRIMEDIA 2003),

manufacturer specifications, and equipment productivity studies collected by Fight

et al. (2003).

Key issues—

Interviews with existing Micromill owners revealed that log sorting is a significant

issue for the production efficiency of the mill. Log sorting can be divided into two

steps. The first entails a preliminary in-woods sort by logging contractors where

logs are placed into size classes; large logs (generally >12-in outside bark, large

end) are grouped for non-Micromill utilization, and small logs (generally <12-in

outside bark, large end) are sorted for Micromill processing. The second step

entails a small-end sort to remove logs with significant taper and a high proportion

of defect. The remaining merchantable logs are sorted into two to four size classes

depending on available markets and desired products.

The cost of in-woods sorting by logging contractors is addressed in a subsequent section on delivered raw log costs. The cost of secondary sorts for product

merchandizing is included in table 2 to the extent that the tractor-loader is used for

manual sorting of logs. Assuming 1,200 PMH, the tractor-loader will sort delivered

small logs into relevant size classes prior to positioning them on the raw log in-feed

chain for processing. Depending on the volume and rate of logs received, more or

less time may be required for secondary sorting.

Annual PMH for the tractor-loader, forklift, and other support equipment is

based on general assumptions provided by mill owners and is subject to change

based on individual circumstances of production rate, raw log volume, distance to

site, and operator proficiency. They are provided to identify key input costs associated with Micromill processing but should not be used as the sole basis for detailed

business planning.

Contrary to the operation of the Micromill, it is most cost efficient to minimize

PMH for all support equipment. Proficiency in operating the loader for log sorting

and the forklift to handle cants is critical. Other methods of secondary log sorting

are also possible, particularly when the Micromill is used as a satellite processor to
GENERAL TECHNICAL REPORT PNW-GTR-623

16

a large log mill. In these situations, it may be most cost effective for all log sorting

(primary in-woods and secondary) to take place by using mechanized log sorters

and by using the tractor-loader simply for placing logs on the in-feed chain. Purchase of mechanized log sorting equipment will significantly increase the cost of

investment but may increase productivity in the long run.

Labor Requirements

Assumptions—

The amount of labor required to operate and maintain the Micromill is based on

information from Skyline Forest Resources and manufacturer recommendations.

The cost of labor is based on skill level, maintenance requirements, employee

fringe benefits and burden, and scheduled annual machine hours. Two scenarios are

examined. The first assumes a standard 40-hour workweek with one highly skilled

operator/supervisor, one person for log sorting and loading, and two people on the

green chain handling cants. The second scenario assumes the same number and

skills of employees over a 50-hour workweek with time-and-one-half overtime rate.

Workers’ compensation rates reflect employer burden for mill operations. All other

figures quoted are based on standard employer burdens as reported by the U.S.

Department of Labor, Bureau of Labor Statistics (2003a-d).

Table 2–Annual operation and maintenance costs of support equipment

Operation and Tractor- Maintenance

maintenance cost items loader Forklift vehicle Chain saw

– – – – – – – – – – – – – Dollars – – – – – – – – – – – – –

Annual depreciationa 3,200 6,400 2,400 0

Opportunity costsb 1,088 2,176 816 0

Insurance and taxes 1,004 2,008 753 0

Maintenance and repairsc 3,200 6,400 2,400 257

Fuel consumption 3,159 3,240 3,240 —

Lube, oil, and filters 1,169 1,199 1,199 —

Total annual operation

and maintenance cost 12,820 21,423 10,808 257

— Amount is negligible.

a Straight-line depreciation based on the purchase of used equipment and duration of financed loan

over 5-year economic life of equipment.

b Opportunity costs are equal to 8-percent interest on money invested.

c Equals 100 percent of annual depreciation.
17

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

The least-cost approach assumes that employees are responsible for all labor

and routine maintenance associated with the Micromill operations, with the exception of concrete slab construction and crane operations for mill siting. Basic

support personnel are responsible for equipment operation of the tractor-loader for

log sorting, mill infeed operation and necessary site preparation, and for the forklift

to stack and load processed cants. Support personnel also are used for handling

cants, site cleanup, blade and knife sharpening, and other technical support as

needed. One highly skilled operator is responsible for the operation and maintenance of the Micromill. Functions include employee supervision, log milling,

product merchandizing and sales, scheduled machine maintenance, knife and blade

sharpening and change-out, log yard organization, and all other functions not

directly the responsibility of support personnel. Specific labor requirements and

considerations include:

• All applicable labor laws and contract requirements.

• Employee fringe benefits.

• Employee insurance and liability.

• Scheduled annual machine hours.

• Skill sets of available employees in an area.

The availability of highly skilled employees is a concern throughout the FourCorners region because of the general lack of forest products manufacturing

capacity in the region. Short of conducting a labor assessment, areas with existing

forest products manufacturing facilities are assumed to have an adequate labor pool

from which to draw. In other areas it will be necessary to relocate or train existing

employees. Basic support personnel are assumed to be available throughout the

study region.

Costs—

Based on the above assumptions, table 3 provides a breakdown of the costs associated with required labor and employee skills. Overlap with special duties related to

move in and setup and site mobilization are addressed in other sections.

Key issues—

Labor costs presented in table 3 represent an employer burden of 38.5 percent for

each employee. Cost considerations are subject to change contingent upon the

actual time the mill is scheduled to be in operation. During periods of prolonged

inactivity owing to inclement weather or availability of logs, it may be necessary to

lay off employees. Although this will reduce overhead costs, mill productivity will

decrease significantly, whereas an increase in hours to 50 per week will significantly increase productivity.
GENERAL TECHNICAL REPORT PNW-GTR-623

18

The increase in mill productivity at 50 hours per week even with the incremental cost of overtime labor will significantly increase the profitability of the mill.

However, this is highly contingent upon the availability of logs, adequate markets

for increased production, and employee willingness to work overtime. The decision

to increase production, even temporarily, will require additional cashflow for a

larger inventory of logs, labor requirements, and increased maintenance and repair.

Additional labor considerations not included here are administrative functions,

sales and marketing, and other nonproduction tasks. Depending on the ownership

structure of the Micromill enterprise, administrative and related functions could be

Table 3–Costs associated with required labor and employee skill levels

Basic support Highly skilled

employeesa (three employeeb

Labor and wage costs employees) (one employer) Total cost

– – – – – – – – – – – – Dollars – – – – – – – – – –

Hourly wage rate (dollars/hour) 9.00 16.50

Weekly wages paid (40 hours/week) 360.00 660.00

Employer burden:c

Weekly fringe benefits (0.115) 41.40 75.90

Unemployment compensation (0.035) 12.60 23.10

Workers’ compensation (0.120) 43.20 79.20

Social security (0.075) 27.00 49.50

Liability (0.040) 14.40 26.40

Per-employee weekly cost (40 hours/week) 498.60 914.10

Total weekly cost (40 hours/week)d 1,495.80 914.10 2,410

Total yearly costs (40 hours/week)d 77,782 47,533 125,315

Overtime benefits:

Overtime rate (dollars/hour) 13.50 24.75

Overtime amount (10 hours/week) 135.00 247.50

Per-employee weekly cost (50 hours/week) 633.60 1,161.60

Total weekly cost (50 hours/week)d 1,900.80 1,161.60 3,062

Total yearly costs (50 hours/week)d 98,842 60,403 159,245

a Employee responsibilities: tractor-loader and forklift operation, log sorting, mill infeed operation, site preparation,

cant handling, cant stacking, truck loading, site cleanup, blade and knife sharpening.

b Employee responsibilities: supervision of all employees and operations, equipment operation, mill operation,

scheduled mill maintenance, product merchandizing and sales, knife and blade sharpening and change-out, and log

yard organization.

c Employer burden is individually calculated for benefits, unemployment and workers’ compensation, and social

security and liability (U.S. Department of Labor, Bureau of Labor Statistics 2003a-d); calculated by multiplying

weekly wages by figure in parenthesis.

d

 Total for three support employees and one skilled employee.
19

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

accomplished by a larger firm that provides support services. For an independently

owned operation, additional labor and overhead cost may be incurred that are not

considered in this analysis.

Delivered Raw Log Costs and Inventory

Assumptions—

Several factors, including harvest conditions, quality of logs, and hauling distances

will influence actual delivered-log prices. Harvest conditions are affected by

operability, which is a function of slope, natural barriers, and seasonality. They are

also a function of the number of trees being cut, size of trees, and spacing between

trees not harvested. The quality of logs being cut is influenced by the amount of

defect present, such as sweep, breakage, weather check, and decay. Lastly, transportation of raw logs to the mill site will affect delivered-log costs. Lynch (2001)

and others (Han et al. 2002) estimate that where raw logs are transported 60 mi

or less, transportation can account for up to 50 percent of raw log costs. Based

on these studies, the least-cost approach assumes that the Micromill will be relocated closer to the raw material source when transportation distances meet or

exceed 60 mi.

The cost of raw logs delivered to the mill site and the quantity of log inventory

will significantly affect profitability and required cashflow. Based on interviews of

log buyers in the Four-Corners region during fall 2003, it is assumed for this

analysis that the cost to purchase delivered small-diameter ponderosa pine logs

(<12-in outside bark, large end) will range between $165 and $200 per thousand

board feet (MBF) within a 60-mi radius.

The required inventory of raw logs available for processing will depend on

seasonality of forest conditions, the availability of timber supply, and the number

of SMH per year for the Micromill. Factors affecting seasonality in the FourCorners region can include summer monsoon rain, winter snow and spring runoff,

and forest fire restrictions. Federal land timber supply is affected by forest fires, as

well as by appeals and litigation and delays in planning. Annual SMH coupled with

available timber supply and harvest seasonality may require greater inventory. One

approach is to assume “just-in-time” delivery of logs to the mill site, whereby logs

are immediately processed and sold to awaiting customers. This scenario requires

minimal investment in an inventory of logs. However, this may not be feasible

given the confounding factors of log supply discussed above. Therefore, for the

current analysis, it is conservatively estimated that a 3-week inventory of 270 MBF

is required for 120 SMH (18 MBF/day for 15 workdays).
GENERAL TECHNICAL REPORT PNW-GTR-623

20

Costs—

For 270 MBF of inventory with delivered-log costs ranging from $165/MBF to

$200/MBF, total cashflow ranges from $44,350 to $54,000. Raw log costs are

subject to change based on size of log, species, condition, and transportation

distance.

Key issues—

As previously discussed, interruptions in SMH and PMH can significantly affect

profitability. Investment in 270 MBF of log inventory provides a consistent supply

of material during periods when weather, fire, or other factors disrupt supply, thus

increasing annual SMH and PMH. The cashflow required for log inventory also

covers operations between the time the logs are purchased and the time when payment is received for finished products produced with the Micromill. A minimum

30-days accounts payable is common practice for payment on delivery of finished

products. Additional cashflow may be required when payment for raw logs is due

before payment received for finished products. This does not include the cost of

compounding interest for investment in log inventory, which is in addition to

onhand cash. Two months of nonproductive time is factored in to account for

inclement weather and disruptions in log supply, but the timing of disruptions will

further influence required log inventory. Because of the sensitivity of economic

return to the cost of delivered logs, both $165/MBF and $200/MBF are assessed in

a subsequent section.

Relocation Costs and Equipment Setup

Logistics and Per-Move Costs

Assumptions—

Logistics and per-move cost of the Micromill are integral parts of the economic

assessment. Site lease and preparation were previously considered in a separate

section to provide a detailed accounting of cost considerations. The number of

moves per year is dependent upon raw log supply, transportation thresholds,

and locations. Related analysis is jointly assessed in a subsequent section.

The least-cost approach of relocating the Micromill involves renting a crane,

two freight trailers, and personnel to move and transport the mill, associated

equipment, and support machinery. The process of relocating the mill typically

takes 2 to 3 days by using hired labor for the crane and trucks and existing
21

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Micromill employees7 (Micromill Systems 2003). The least-cost approach assumes

that mill employees will not need lodging or per diem and will commute daily to

the mill site (no additional costs incurred).

Preparation for the new mill site should occur before transporting the mill to

minimize rental costs for the crane and freight trailers, as well as to minimize lost

production time. A minimum of four laborers will be needed to assist in the

Micromill relocation; it is assumed that the same mill laborers will work at all new

locations. These labor costs are included in the annual labor costs considered in a

previous section.

Costs—

Based on the above scenario and key assumptions, relocation costs include crane

rental with operator (at $100/hr) of $700 and rental of two freight trucks at $2/

truck/mile. Thus, a 60-mi move would cost $940 ($700 + $240). By comparison, a

100-mi move would cost $1,100 ($700 + $400). Costs are on a per-move basis.

Additional considerations with move-in cost were addressed in a preceding section.

Key issues—

Based on transportation costs, it is expected that the Micromill will be relocated

within 60 mi of the raw material source. By incorporating existing mill laborers,

the only other labor required is a crane operator and two freight drivers, which are

included in rental costs. It should again be noted, however, that this figure does not

include related costs of site preparation, lease, and construction of a concrete slab.

Market Return

There are many finished product options associated with the Micromill. We

investigated products and available markets for the Four-Corners region. Mill

productivity and lumber recovery data collected by Lowell are used to determine

viable market scenarios.8

 Economic returns are specifically assessed for a mix of

green, rough-cut lumber, kiln-dried and surfaced lumber, and byproducts from

chips. In the case of kiln-dried and surfaced lumber, rough-cut cants processed by

using the Micromill are transported to secondary processing facilities for further

manufacturing. Current and expected market prices were gathered by analyzing

7 Porters, O. 2003. Micromill mobilization costs and logistics. Owner and operator of

Gerrard Plantations (August 21).

8 Information on file with the USDA Forest Service, Pacific Northwest Research Station,

Forestry Science Laboratory, Ecologically Sustainable Production of Forest Resources

Team, 620 SW Main, Suite 400, Portland, OR 97205.
GENERAL TECHNICAL REPORT PNW-GTR-623

22

national and local trends shown in market reports compiled by the Western Wood

Products Association from 1971 to 2002 for Rocky Mountain ponderosa pine

(Haynes 2003). Other market options and niche markets may be available in

different regions of the country or under different market conditions.

Mill Productivity

Assumptions—

The production capacity of the Micromill differs according to tree species, average

log diameter, and log length. It is also dependent upon the skill of the operator to

maximize mill speed and ensure logs are sorted for product optimization. The

Micromill is capable of producing flatsawn and quartersawn lumber by using a

single-pass system that increases productivity. Log lengths need to include adequate trim to produce standard end-product dimensions. Green target sizes will

need to allow for drying shrinkage, sawing variation, and planer allowances.

In table 4, observed and published Micromill production capacities are provided for the SLP5000D model. Published rates are based on a 12-ft log length for

presorted spruce (Picea spp.), pine, and fir (Micromill Systems 2003). Observed

rates are based on 8-ft log lengths for presorted ponderosa pine with an average

butt end log diameter of 8 in, cut into a 4-in square cant.9

 To compare published

and observed rates, use hourly production for 4-in square cant. Observed differences will result from variability in operator experience, average log diameter, and

cant size. Productivity rates, combined with grade recovery, are provided to assess

market returns for ponderosa pine in the Four-Corners region.

Grade Recovery

Assumptions—

To determine the economic return from small-diameter trees, it is necessary to

know how much product can be manufactured from trees of various diameters and

the finished product grades. A sample of 1,343 ponderosa pine logs from Flagstaff,

Arizona, was scaled, and cubic and Scribner volumes were calculated (USDA

Forest Service 1985, 1991; Western Wood Products Association 1998). Two sizes

of cants were manufactured: 4- by 4-in and 3- by 3-in, along with a small volume of

1-in boards. Lumber from each log was tracked from sawmill through kiln and

planer. Following kiln-drying and planing, lumber from each log was tallied for

size and grade. By using gross cubic log volume, green lumber recovery for logs

9

 Steed, S. 2003. Personal communication. Owner and operator, Skyline Forest Resources,

P.O. Box 379, Escalante, UT 84726.
23

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

with a small-end diameter inside bark of 3 to 7 in averaged 66.2 percent. Surfaced,

dry lumber recovery averaged 46.5 percent. Results are presented in cubic scale;

small, shorter logs often have no measurable Scribner scale (no merchantable

volume) because scaling equations are better suited for larger trees (USDA Forest

Service 1985). As an alternative, mill owners may use a per-log cost to calculate

price, or a weight scale could be developed. Lumber grade recovery data from the

logs of trees harvested in Flagstaff are presented in table 5 and used in the analysis

to select viable market scenarios.

Key issues—

Table 5 shows that of the 4- by 4-in Standard and better lumber, 51 percent was

derived from ponderosa pine logs with a 6-in small-end diameter. Most of the

remaining lumber in this grade came from trees with a 5-in top (42 percent).

However, it is not possible to determine maximum market return across all size

classes because the sample data are not representative of the distribution of tree

size classes across a given forest area. The sample represents the range of diameters present and was stratified by diameter class. The range of markets available

for small-diameter ponderosa pine is assessed in the following section.

Market Options

Assumptions—

MicroMill Systems, Inc., reports a wide range of products utilizing 3- to 13-in

logs (diameter outside bark, large end) including 1- by 4-, 1- by 6-, 2- by 4-, 2- by

6-, 4- by 4-, 6- by 6-in, and other variations. However, dimension lumber products

(e.g., 2 by 4 in and 2 by 6 in) are generally not a viable option for small-diameter

ponderosa pine because of the high proportion of juvenile wood (Erickson et al.

Table 4–Observed and published production rates for the Micromill SLP5000D

Specification Production rate

Observeda – – – – – – – – Publishedb – – – – – – – – –

Average butt-end log diameter (in) 8 12 10 8 6 4

Square cant size (in) 4 8 7 6 4 3

Estimated feed rate (ft/minute) 55 50 55 60 65 70

Hourly production (board feet) 3,000 12,250 10,375 6,500 3,250 2,125

Monthly production (thousand board feet) 504 2,050 1,750 1,100 550 350

a Based on 8-ft log length, 21 working days/month, and one 8-hour shift per day. Figures are based on a continuous run

of presorted ponderosa pine with an average butt-end diameter of 8 in.

b Based on 12-ft log length, 21 working days/month, and one 8-hour shift per day. All figures are based on a continuous

run of presorted, uniform-sized spruce, pine, or fir logs.
GENERAL TECHNICAL REPORT PNW-GTR-623

24

2000, Larson and Mirth 1999). Small-diameter ponderosa pine in the Southwest is

characterized by suppressed growth with poor strength properties and poor product

drying capabilities (Argenbright et al. 1978, Voorhies and Blake 1981). Independent studies by Lowell and Green (2001) suggest that sawing of appearance-grade

lumber (1-in thick boards) might be a more valuable alternative when processing

logs in the 5- to 10-in small-end diameter classes. These boards are used for interior shelving, facing, and other less demanding structural purposes. Fencing, landscaping timbers, siding, pallets, posts, and poles are other potential solid wood

options.

Three types of products manufactured with the MicroMill are assessed here for

ponderosa pine. The first are green, rough-sawn products: 1- by 4-in boards and

4- by 4-in cants used for pallets and fencing. The second are kiln-dried and surfaced 1- by 4-in and 1- by 6-in boards, and 4- by 4-in flitches intended for remanufacturing into finished lumber. The third are byproducts such as “dirty” chips

produced in sawing logs and used for commercial wood pellets and biomass for

energy production. Chips are considered dirty when they contain bark and other

impurities. Prices for landscaping and mulch are not assessed because of the

requirement to add an additional piece of machinery (a debarker) to the mill

operation; equipment is required to remove the bark from logs for these uses.

Product options are examined for high, low, and average wholesale markets. In

addition, observed markets for the Four-Corners region, as assessed in October

2003, are provided to reflect proven product markets.

Table 5–Percentage of size-class grade recovery for ponderosa pinea

Log small-end diameter (in)

Lumber size Lumber grade 3 4 5 6 7

Inches – – – – – – – Percent – – – – – – –

1 by 4 Common and better 0 0 0 38 62

1 by 4 3, 4, and 5 Common 0 0 2 71 27

3 by 3 Standard and better 1 46 52 1 0

3 by 3 Economy 6 64 28 2 0

4 by 4 Standard and better 0 2 42 51 5

4 by 4 Economy 0 11 51 30 8

a Data from Lowell.
25

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Costs—

What follows in table 6 are projected gross market returns for assessed Micromill

products under different market conditions. Gross returns are based on Rocky

Mountain ponderosa pine prices as compiled by the Western Wood Products

Association from 1971 to 2002 (Haynes 2003). Invoices submitted to the association by a sample of mills are used to establish high, low, and average markets for

the past 5 years, which were selected to represent the most likely range of shortterm economic returns.

Key issues—

The difference in market prices between green, rough-sawn lumber and kiln-dried

and surfaced lumber is significant. However, the cumulative cost of secondary

processing can exceed $115/MBF for milling, kiln drying, and surfacing (see

footnote 9). Transportation costs also are incurred to haul rough-cut cants to a

secondary facility. One justification for secondary processing is that between 25

and 30 percent more wood can be hauled per load in square form rather than round

(Markstrom 1982). Assuming 300 cants (6 by 6 in by 16 ft 6 in long) per truckload

and 49.5 BF/cant, average truckload volume is 14.85 MBF. A 300-mi roundtrip at

$1.15 per mile amounts to $345 in total costs, or $23/MBF ($345 ÷14.85 MBF).

For this scenario, an additional $138/MBF ($115/MBF + 23/MBF) is required in

market return to offset the cumulative costs for secondary processing and transport.

Additional processing is only practical if the finished product results in a

higher grade. If the Micromill operates onsite as a satellite to a larger mill or if a

secondary processing facility is closer, secondary processing may be more feasible.

Raw logs greater than 8 in on the small end (outside bark) are capable of

producing 6- by 6-in rough-cut cants suitable for secondary processing. Smaller

logs (5- to 8-in small-end diameter, outside bark) will likely be processed for lower

quality 4- by 4-in cants and 1- by 4-in boards. The actual mix of rough-sawn and

secondary products will differ according to the number, size, taper, and grade

of logs harvested. The mix of lumber grades within secondary processed

products and rough-cut products also may differ. For instance, the large number of knots and other characteristics common to small-diameter ponderosa pine

commonly diminishes the percentage of cants processed into 1- by 4-in and

1- by 6-in Common and better lumber.

The dirty chips produced when manufacturing cants and the clean chips in

surfacing lumber can account for 35 percent or more of the original raw log

depending on size of log and desired cut dimensions. Although byproducts generally do not provide substantial profit, they can provide additional revenue. The
GENERAL TECHNICAL REPORT PNW-GTR-623

26

Table 6–Projected gross market returns for ponderosa pine lumber, inland

mills, 1998-2002

Market scenarioa

Product size Finished product grade Observed Low Average High

In Dollars per thousand board feet

Kiln dried, surfaced:b

1 by 4, 6 2 Common and better 530 453 500 548

1 by 4, 6 3 and 4 Common 275 201 245 278

4 by 4 Standard 350 —c —c —c

4 by 4 Economy 300 —c —c —c

Green, rough sawn:

4 by 4 Standard, Economy 200 —c —c —c

1 by 4 3 Common, Utility 220 164 190 219

1 by 4 5 Common, Economy 150 110 134 155

Byproductsd

Wood chips Dirty, including bark 4-20/BDT —c —c —c

a Observed markets are for ponderosa pine products sold in the Four-Corners region in October 2003.

Low, average, and high market prices were compiled by the Western Wood Products Association and

reported by Haynes (2003).

b Kiln-dried, planed products will require additional manufacturing and transportation to a secondary

processing facility independent of mobile Micromill operations.

c The Western Wood Products Association does not compile price data for this category.

d Chip byproducts are “dirty” owing to bark and other impurities. Chip prices are based on biomass

purchases for bioenergy powerplants and pellet manufacturing in the Southwest (per bone dry ton

[BDT], zero percent moisture). Prices will differ significantly based on distance to market.

market for dirty chips in the Four-Corners region ranges from $4/bone dry ton

(BDT; zero percent moisture content) to $20/BDT (see footnote 9); regional

markets are diminished because of the lack of processors within a reasonable haul

distance. Micromill operations located closer to pellet or bioenergy markets may

bring substantially greater return.

Annual Costs and Break-Even Analysis

Annual fixed and variable costs are assessed against predicted annual revenue to

provide investors with an estimate of the minimum amount of revenue needed

to be financially solvent. Total revenue is derived from the sale of green products

and kiln-dried and surfaced products identified in table 6. Three break-even scenarios are analyzed based on total costs reported in table 7 and likely mobile processing options. Because of the sensitivity of economic return to variable log costs,

delivered-log prices are analyzed for $165/MBF and $200/MBF.
27

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Table 7–Annual fixed and variable costs of mobile Micromill processing

Processing costs Total annual cost Total cost (per MBF)a

Dollars

Fixed costs:

Downpayment (30 percent; year 1 only)—

MicroMill 129,956 36.10

Support equipmentb 24,188 6.72

Annual financing—

MicroMill 70,609 19.61

Support equipmentb 16,001 4.44

Site lease and preparationc 3,000 .83

Total fixed costs—

Year 1 243,754 67.71

Successive year 89,610 24.89

Variable costs:

Annual operation and maintenance—

MicroMill 150,476 41.80

Support equipmentb 45,307 12.59

Annual labor (40 hours/week) 125,315 34.81

Annual raw log inventoryd —

$165/MBF delivered-log cost 594,000 165.00

$200/MBF delivered-log cost 720,000 200.00

Mill relocationc 900 .25

Total variable costs—

$165/MBF delivered-log cost 915,998 254.44

$200/MBF delivered-log cost 1,041,998 289.44

a Total costs are assessed on an annual per-thousand-board-foot (MBF) basis for 3,600 MBF of

production.

b Includes tractor-loader, forklift, and maintenance vehicle.

c Site lease costs are highly variable depending on landowner and duration of lease. Price includes cost

of constructing a concrete pad for the mill. Additional costs will be incurred with each move.

d Based on 3,600 MBF inventory of small-diameter ponderosa pine (<12 in large-end diameter, outside

bark).

e Cost is on a per-move basis.
GENERAL TECHNICAL REPORT PNW-GTR-623

28

Market Scenarios

The three market scenarios are:

Market scenario 1–100 percent of logs are processed into green, 4- by 4-in by

8-ft cants.

Market scenario 2–50 percent of logs are processed into green 1- by 4- and/or

6-in 3 Common grade lumber; the remaining 50 percent are processed into kilndried and surfaced 1- by 4- and/or 6-in 2 Common and better grade boards.

Market scenario 3–50 percent of logs are processed into green, 4- by 4-in

by 8-ft cants; the remaining 50 percent are processed into kiln-dried and surfaced

4- by 4-in by 8-ft cants graded Standard and better.

Costs—

To estimate cost-to-revenue ratios, similar units of analysis are needed to aggregate

costs, production, and revenues. All variables are measured on a per-thousandboard-feet-of-production basis. Annual production rates are based on observed

hourly productivity of the SLP5000D Micromill for ponderosa pine. Assuming an

observed hourly production rate of 3 MBF (table 4) and a conservative utilization

rate of 1,200 PMH annually, annual production is estimated at 3,600 MBF (3 MBF

x 1,200 PMH). This rate is used to calculate break-even points for the different

market scenarios assessed for a 5-year period.

Fixed costs—

Initial downpayments of 30 percent for the purchase of the Micromill and support

equipment are most of year 1 fixed costs (which total about $68/MBF), but will

lead to decreased fixed costs in succeeding years. Annual financing for the mill and

support equipment is $19.61/MBF and $4.44/MBF, respectively. In addition, fixed

costs will be increased by the annual cost of site lease and preparation (assumed

here to be one move per year). Total fixed costs for year 1 are nearly $244,000.

Successive annual fixed costs are equal to the amount of site lease and preparation

plus annual financing costs. Total fixed costs for successive years are approximately $90,000 and remain the same regardless of the volume of board feet processed.

Variable costs—

Based on the previously identified figures, annual labor costs are $34.81/MBF, and

operation and maintenance for all equipment contributes an additional $54.38/MBF

in variable costs. Assuming a delivered raw log cost of $165/MBF, annual variable
29

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

costs are about $254/MBF or $916,000; assuming a delivered cost of $200/MBF,

annual variable costs are about $289/MBF or $1,042,000. Delivered raw logs are

nearly 65 percent of total variable costs. Because they compose the bulk of total

costs and because delivered logs are likely to be the most variable of all costs,

reducing these costs to increase economic return is sensible. Siting the mill closer

to the raw material source is one option to reduce log prices. Costs of labor and

operation will fluctuate depending on PMH.

Total costs—

Fixed costs plus variable costs equal total costs of about $322/MBF in year 1 based

on a delivered-log price of $165/MBF and about $357/MBF in year 1 based on a

delivered price of $200/MBF. To break even in the first year of operation, investors

would need $322 and $357, respectively, in revenue for each thousand board foot

of production. Spreading out the downpayment payback over more time lowers the

revenue needed per thousand board foot to break even. For instance, assuming a

delivered-log price of $200/MBF, $335/MBF of total costs are incurred in year 2

([year 1 fixed costs, $243,754 + year 2 fixed costs, $89,610] ÷ [year 1 production,

3,600 MBF + year 2 production, 3,600 MBF] + annual variable costs, $289/MBF).

Therefore, a minimum of $335/MBF of revenue is needed to break even in year 2.

Breaking even by year 3 will require $328/MBF in revenue based on the same

assumptions.

Break-even analysis—

The profitability for each scenario for a 5-year period is reported in table 8. Based

on observed markets for the Four-Corners region, the $200/MBF of revenue generated from the sale of rough-cut, green 4- by 4-in by 8-ft cants in market scenario

1 is not adequate to sustain mobile Micromill operations, regardless of whether

delivered-log prices are $165/MBF or $200/MBF. Market scenario 2 assumes that

50 percent of rough-cut cants will be transported to a secondary processing facility

for increased market return. As previously reported, it is assumed that milling,

drying, and surfacing of cants incurs an additional $138/MBF for secondary

processing and a 300-mi roundtrip transport. Based on an observed market return

of $392/MBF for 2 Common and better lumber ($530/MBF revenue - $138/MBF,

secondary processing and transport) and $220/MBF for green 3 Common, an

average return of $306/MBF is realized. This is adequate to offset total costs and

produce a profit after year 3 for delivered-log costs of $200/MBF and under.
GENERAL TECHNICAL REPORT PNW-GTR-623

30Table 8–Five-year break-even analysis showing cumulative profit (loss) for assessed solid-wood markets based on delivered-log costs of

$165/MBF and $200/MBF

Net return

Market scenario 1c Market scenario 2f Market scenario 3g

Mill Full Third-party Full Third-party Full Third-party

Year production Fixed costa Total costb financingd Financinge financingd financinge financingd financinge

$165/MBF delivered-log cost

Thousand

board feet – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – Dollars – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

1 3,600 243,754 1,159,751 -439,751 -195,998 -58,151 185,602 -418,151 -174,3982 7,200 89,610 2,165,359 -725,359 -635,748 37,841 127,452 -682,159 -592,5483 10,800 89,610 3,170,967 -1,010,967 -921,356 133,833 223,444 -946,167 -856,5564 14,400 89,610 4,176,575 -1,296,575 -1,206,964 229,825 319,436 -1,210,175 -1,120,5645 18,000 89,610 5,182,183 -1,582,183 -1,492,572 325,817 415,428 -1,474,183 -1,384,572$200/MBF delivered-log cost1 3,600 243,754 1,285,751 -565,751 -321,998 -184,151 59,602 -544,151 -300,3982 7,200 89,610 2,291,359 -851,359 -761,748 -88,159 1,452 -808,159 -718,5483 10,800 89,610 3,296,967 -1,136,967 -1,047,356 7,833 97,444 -1,072,167 -982,5564 14,400 89,610 4,302,575 -1,422,575 -1,332,964 103,825 193,436 -1,336,175 -1,246,5645 18,000 89,610 5,308,183 -1,708,183 -1,618,572 199,817 289,428 -1,600,183 -1,510,572a Year 1 fixed costs are equal to the total of downpayment, annual financing costs, and site lease and preparation. Successive-year fixed costs are equal to the total of annual financing

costs, and site lease and preparation.

b Total costs are equal to annual fixed costs plus annual variable costs.c Market scenario 1 is assessed for 100 percent of logs processed into green, rough-cut, 4- by 4-in by 8-ft cants. Revenue equals $200/thousand board feet (MBF). d Private investor is responsible for the full purchase price and financing of the SLP5000D Micromill and related support equipment. e A third party is responsible for the purchase and financing of the SLP500D Micromill and support equipment.f Market scenario 2 is assessed for 50 percent of logs processed into green, rough-cut 1- by 4-in or 1- by 6-in 3 Common grade boards ($220/MBF), and 50 percent of logs

processed into 1- by 4-in or 1- by 6-in 2 Common and better grade boards (kiln-dried and surfaced). Average revenue equals $306/MBF. g Market scenario 3 is assessed for 50 percent of logs processed into green, rough-cut, 4- by 4-in by 8-ft cants ($200/MBF), and 50 percent of logs processed into 4- by 4-in

by 8-ft Standard and better cants (kiln dried and surfaced). Average revenue equals $206/MBF.
31

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Market scenario 3 also assesses economic return based on 50 percent of roughcut cants processed at a secondary facility. An average return of $206/MBF is

realized assuming 4- by 4-in by 8-ft cants are graded Standard and better ($350/

MBF revenue - $138/MBF, secondary processing and transport) and the remaining

logs are processed into rough-cut 4- by 4-in by 8-ft cants ($200/MBF). As in

market scenario 1, there is inadequate revenue to offset the costs of production for

this scenario.

Where profit margins are small, the added revenue created from the sale of

byproducts may be significant even though they are not likely to greatly affect total

economic return. On average, approximately 5 BDT of dirty chips are produced per

day per 18 MBF of production (approximately 0.28 ton/MBF). Assuming a favorable market of $20/BDT for bioenergy production (TSS Consultants 2002), $5.60

in revenue is added per thousand board foot, which more than covers the cost of

support equipment financing. Additional costs may be incurred for disposal if

markets for dirty chips are not available.

Key issues—

The break-even analysis is provided to illustrate the minimum amount of revenue

needed to simply cover the costs of production. Based on the market scenarios,

mobile processing of small-diameter ponderosa pine is not a feasible enterprise for

market scenarios 1 and 3; only market scenario 2 is feasible, and only if the

assumed lumber grades can be achieved. It should be noted that the volume of

finished product could exceed the scaled volume of merchantable material resulting in an overrun, which would increase profitability. Since information is lacking

on predicted overrun or under-run scenarios for small-diameter ponderosa pine,

they were not assessed. Instead, the predicted volume of merchantable raw logs

was assumed equal to the volume of finished products.

Another way to increase profitability is to decrease the fixed costs of equipment purchase through third party purchase of the mill, such as by the federal

government or a private foundation through a grant. Each market scenario was

analyzed based on the purchase of the Micromill and support equipment whereby

all purchase costs and annual financing incurred by an investor are equal to $0.00.

The mill owner only incurs expenses for annual variable costs. The reduction in

total fixed costs with third-party financing is approximately $244,000 in year 1

or about $68/MBF, and approximately $90,000 in successive years or $25/MBF

(table 7). Although the financial returns are increased for all three scenarios,

markets 1 and 3 still do not provide adequate revenue to offset costs (table 8).
GENERAL TECHNICAL REPORT PNW-GTR-623

32

Relative to variable costs, particularly for delivered logs, the decreased cost resulting from third-party purchase is not adequate. Market scenario 2 remains profitable

by a greater margin.

The break-even analysis illustrates that mobile processing of small-diameter

ponderosa pine, independent of the purchase and operation of the Micromill, is

feasible given favorable market conditions. However, it is not an economically

feasible enterprise given poor to average markets or when a high percentage of

finished products are low-quality lumber. If markets improve or the delivered price

of raw logs decreases through subsidization or other means, mobile operations

could become more feasible. The processing of small-diameter ponderosa pine also

could become more viable if located on site or closer to a secondary processing

facility increasing the range of finished products possible. However, as the mill is

located farther away from raw material sources and closer to secondary processing

facilities, delivered log prices may increase.

Another option is to increase the utilization rate of the Micromill by increasing

operations to a 50-hour workweek. Assuming an observed hourly production rate

of 3 MBF (table 4) and an increase in utilization to 1,500 PMH annually (2,000

SMH), annual production is estimated at 4,500 MBF (3 MBF x 1,500 PMH).

Variable costs decrease slightly. Scenarios 1 and 3 remain unprofitable, while

scenario 2 increases in profitability. Similar profit margins result when also increasing the utilization rate to account for a longer operating season of 11 months (2,300

SMH).

A market option is to seek niche markets for which small-diameter ponderosa

pine products are better suited. The markets assessed herein are based on traditional

lumber markets in which products must compete with Douglas-fir (Pseudotsuga

menziesii (Mirb.) Franco), hemlock (Tsuga heterophylla (Raf.) Sarg.), and various

southern pines like shortleaf pine (Pinus echinata (Mill.)), loblolly pine (Pinus

taeda (L.)), and longleaf pine (Pinus palustris (Mill.) Michx.), which have more

desirable strength and hardness properties. Niche markets such as fiber-reinforced

polymer glue-laminate beams, wood/plastic composite cabinet panels and molding,

and wood-hardening treatments used for flooring and fire-resistant decking are

examples of value-added products with substantially greater market return (Mater

Engineering 2002). However, most will require secondary manufacturing, which

does not guarantee greater economic return for unfinished Micromill products.

Finally, does the investment in a mobile Micromill cover the costs of simply

transporting all logs to a stationary mill for processing? To answer this, it is assumed that 100 percent of logs are shipped to a sawmill with a roundtrip distance

of 300 mi. All logs are processed into kiln-dried and surfaced lumber where 50
33

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

percent result in 1- by 4-in or 1- by 6-in 2 Common and better grade boards

($530/MBF observed market price) and the remaining, 1- by 4-in or 1- by 6-in

3 Common grade lumber ($275/MBF observed market price) (table 6). The average market price for processed lumber for this scenario is $403/MBF. Assuming

logs are shipped in round form as opposed to square cants, volume per load is

reduced by 30 percent resulting in 11.1 MBF per truckload. The adjusted cost to

transport raw logs 300 mi is $31/MBF. Total transportation and processing costs

equal $146/MBF, including $115/MBF for processing. Subtracting transportation

and processing costs from average market price results in an average return of

$257/MBF. Assuming raw log cost of $200/MBF, revenue is reduced to $57/MBF.

Raw log costs are assumed to be greater in this case because of the competitive

disadvantage of distance from the resource and the likelihood that log deliveries

will include larger, more valuable logs to offset transportation costs. The remaining

$57/MBF must be great enough to cover all fixed costs of investment as well as

variable costs for operation and maintenance. Depending on the age and condition

of the stationary mill, fixed costs, and operation and maintenance likely will

exceed this amount. Certainly, net revenue increases as the resource is closer to the

mill; delivered-log prices decrease as will total transportation costs. Based on this

scenario, the purchase of a Micromill is a preferred alternative where market

returns approximate those in market scenario 2 analyzed above.

Discussion

When deciding to invest in small-log-processing technology, it is important to

consider the combined market return for the mix of products manufactured at or

with the Micromill. Although higher value products can be produced with the

Micromill, the availability of high-quality logs, distance to markets, and the ability

to find a buyer will dictate which products to manufacture. Also, other factors

affect profitability. The following is a synthesis of critical costs and key factors to

consider in the decision to invest in mobile processing.

Cashflow Requirements

Optimizing productivity, quality control of products and seeking markets, will

initially require a substantial amount of time. Productivity will be lower during

initial operations to allow for training employees and configuring the mill to the

most financially efficient operation. It is expected that revenue generated from the

sale of finished products will begin 3 months or more after the initial purchase of

the raw logs. Depending on investment costs, operations and maintenance, labor,

and the costs of delivered raw logs, cashflow required for the first 3 months could
GENERAL TECHNICAL REPORT PNW-GTR-623

34

exceed $450,000. Additional cashflow is contingent upon the timing of finished

product sales and delivery. Onhand cash will be necessary to maintain operations

through intermittent periods of unscheduled downtime and variable market cycles

to ensure an adequate supply of raw logs available for processing. Approximately

$65,000 of onhand cash is necessary for a 15-day inventory of logs based on

production of 18 MBF/day. This does not include the cost of compounding interest

for investment in log inventory, which is in addition to onhand cash.

Key Factors Affecting Profitability

There are numerous factors affecting the profitability of a mobile Micromill

enterprise; many are interdependent. Although each has been discussed in prior

sections, they are discussed here to aid in understanding the relationships among

them.

Resource inventory and management goals—

Before investing in a Micromill, or any other mobile mill technology, it is crucial to

understand the characteristics of the forest resource available for harvest. Significant among these factors is determining if there is a sufficient and consistent

volume of small-diameter material to pay off investments. The species composition

and its physical characteristics (Barbour et al. 2003) within the supply region also

must be taken into account as well as access to the timber, given existing transportation networks. It is equally important to understand the goals of the resource

manager and his or her management constraints to ensure that a consistent supply

of logs will be available for the duration of the capital investment. Projected sale

volumes, log quality, and harvest cycles are important factors to consider (Swan

2003).

Log handling, sorting, and transportation—

Costs are incurred each time a log is handled, whether they are for harvesting and

skidding, forwarding to the landing, delimbing and loading, transportation to the

mill, scaling, sorting, and processing. Therefore, it is important to match in-woods

harvesting and handling operations with the type and size of logs suited for the

mill. If the Micromill is a stand-alone operation (not situated as a satellite to a

larger mill), it will be advantageous to conduct a preliminary sort at the log landing

to ensure only small-diameter logs are transported to the Micromill site. Subsequent sorting into diameter classes may then take place at the mill site for product

optimization.
35

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Unscheduled downtime—

The amount of time the Micromill is operating affects the quantity of products that

can be sold to consumers. In the case of small-diameter timber, more logs generally

have to be processed to obtain the volumes necessary to be economically viable.

Unscheduled downtime reduces the overall volume processed in a given year.

Unscheduled downtime may include any number of factors like weather conditions

or fire restrictions, to which a mobile mill will be more susceptible. It also may

include major breakdowns of the mill or breakdowns associated with the logging

contractor that disrupts the supply of logs to the mill. Supply disruptions leading to

unscheduled downtime also may include appeals and litigation or project planning

when procuring federal- or state-owned timber.

Productive machine hours—

This analysis was based on PMH for a 40-hour workweek. Increasing the hours of

operation from 40 to 50 hours per week or adding a second shift will significantly

affect return on investment. Additional operation and maintenance costs will be

incurred for an increase in PMH, but the investment payback period with compounding interest would be decreased.

Product markets—

It is not enough to know that certain products can be manufactured from different

species and diameters of trees, you must also know whether there are markets for

the types and amounts of material proposed for harvest (Spelter et al. 1996). In the

case of small-diameter ponderosa pine, it is unlikely that dimension lumber (without physical modification) will be a strong market because of its poor structural

properties (Erickson et al. 2000). Similarly, alternative manufactured ponderosa

pine products will have to compete in markets with other species. Lumber grade

recovered also will affect market return. Expertise in milling ponderosa pine will

affect how logs are sorted and merchandised to maximize lumber grade recovery.

Attention to the volume and quality of byproducts produced and associated markets

for woodchips is necessary.

Secondary manufacturing—

Further processing of rough-cut, green cants produced by the Micromill will

significantly increase the per-unit value of ponderosa pine products. However,

additional processing costs will be incurred. These costs include transportation to

the processing facility, the remanufacturing, kiln drying, and surfacing. The economic return realized from any secondary processing must exceed its costs. It is
GENERAL TECHNICAL REPORT PNW-GTR-623

36

also important to understand product recovery capabilities of secondary processing

facilities to achieve desired returns.

Other costs—

In addition to those factors listed above, there are other costs ranging from administrative and overhead costs for office expenses and accounting, to costs for site

preparation and cleanup, property lease, and road access. Other factors not identified in this assessment also may affect feasibility of a mobile Micromill enterprise.

Conclusion

The proceeding analyses allow for increased understanding of the key costs and

market options for the SLP5000D Micromill to facilitate sound investment in

mobile small-wood processing technology. Other issues not fully addressed include

the sensitivity of changes in assumptions, unforeseen cost increases, transportation

thresholds, changes in markets and economic climate, and monthly pro forma

balance sheets. Assumptions made in the study are based on a least-cost approach

that reflects observed operations of existing Micromill owners. A conservative

estimate is used to derive break-even points for fixed and variable costs, and market

returns. There are a number of alternative scenarios likely to produce competitive

results depending on site-specific factors. Raw material costs for small-diameter

ponderosa pine are not expected to increase without improved markets for finished

products, yet there are a number of variable costs that can change.

Specific transportation thresholds were not identified in the analysis. The

decision of when to move the mill and the maximum allowable distance to the raw

material source is highly dependent upon existing market conditions, log supply,

and delivered-log costs. The distance to markets and secondary processing facilities

also will influence mill relocation.

It is difficult to identify an optimal mix of finished products for small-diameter

ponderosa pine with respect to changing consumer demand, variable markets, and

economic conditions. Markets are subject to a complex array of uncontrollable

factors. For these reasons, a comprehensive financial plan and monthly/yearly pro

forma are not provided, but are necessary for making investment decisions. The

purpose of this study was to quantify important costs and market options. It is not a

substitute for a comprehensive business plan. Cashflow requirements and economic

return will differ depending on access to capital, magnitude of operations, and

markets realized.
37

Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

Metric Equivalents

When you know: Multiply by: To get:

Inches (in) 2.54 Centimeters

Feet (ft) .3048 Meters

Yards (yd) .914 Meters

Acres .405 Hectares

Miles (mi) 1.609 Kilometers

Cubic feet (ft3

) .0283 Cubic meters

Cubic yards (yd3

) .765 Cubic meters

Gallons (gal) 3.78 Liters

Pounds (lb) 454 Grams

Tons 907 Kilograms

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Economic Assessment of Using a Mobile Micromill® for Processing-Small-Diameter Ponderosa Pine

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GENERAL TECHNICAL REPORT PNW-GTR-623

40

U.S. Department of Agriculture, Forest Service. 2003. A strategic assessment

of forest biomass and fuel reduction treatments in Western States. http://

www.fs.fed.us/research/infocenter.html. (October 1).

U.S. Department of Labor, Bureau of Labor Statistics. 2003a. 2002 state

occupational employment and wage estimates, Arizona. On file with: U.S.

Bureau of Labor Statistics, Division of Occupational Employment Statistics,

Suite 2135, 2 Massachusetts Ave., NE, Washington, DC 20212-0001. http://

stats.bls.gov/oes/2002/oes_az.htm#b45-0000. (October1).

U.S. Department of Labor, Bureau of Labor Statistics. 2003b. 2002 State

occupational employment and wage estimates, Colorado. On file with: U.S.

Bureau of Labor Statistics, Division of Occupational Employment Statistics,

Suite 2135, 2 Massachusetts Ave., NE, Washington, DC 20212-0001. http://

stats.bls.gov/oes/2002/oes_co.htm#b45-0000. (October 1).

U.S. Department of Labor, Bureau of Labor Statistics. 2003c. 2002 State

occupational employment and wage estimates, New Mexico. On file with: U.S.

Bureau of Labor Statistics, Division of Occupational Employment Statistics,

Suite 2135, 2 Massachusetts Ave., NE, Washington, DC 20212-0001. http://

stats.bls.gov/oes/2002/oes_nm.htm#b45-0000. (October 1).

U.S. Department of Labor, Bureau of Labor Statistics. 2003d. 2002 State

occupational employment and wage estimates, Utah. On file with: U.S.

Bureau of Labor Statistics, Division of Occupational Employment Statistics,

Suite 2135, 2 Massachusetts Ave., NE, Washington, DC 20212-0001. http://

stats.bls.gov/oes/2002/oes_ut.htm#b45-0000. (October 1).

Voorhies, G.; Blake, B.R. 1981. Properties affecting drying characteristics of

young-growth ponderosa pine. Arizona Forestry Notes No.14. Flagstaff, AZ:

Northern Arizona University. 27 p.

Western Wood Products Association. 1998. Western lumber grading rules 98.

Portland, OR. 248 p.
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