![](media/image1.wmf){width="2.15in" height="0.8076388888888889in"}

**ANALYTICAL RESULTS FOR MINE DUMP SAMPLES AND LEACHATE SOLUTIONS, UPPER
ANIMAS RIVER WATERSHED, SAN JUAN COUNTY, COLORADO**

***by* David L. Fey^1^, J. Thomas Nash^1^,**

**Douglas B. Yager, and George A. Desborough^1^**

# Open-File Report 00-0338

**2000**

This report is preliminary and has not been reviewed for conformity with
U.S. Geological Survey editorial standards and stratigraphic
nomenclature. Any use of trade, product, or firm names is for
descriptive purposes only and does not imply endorsement by the U.S.
Government.

**U.S. DEPARTMENT OF THE INTERIOR**

## U.S. GEOLOGICAL SURVEY

^1^ Denver, Colorado

This report contains text, linked to Excel spreadsheet data files. The
following list provides the names and describes the contents of the
files comprising this report.

LIST of FILES

1: **SDCHEMOF.DOC** Text of Open-File Report: MS-WORD format

2: **SDCHEMOF.PDF** Text of Open-File Report: Adobe PDF format

3: **SDSITE.xls** Sample localities and descriptions: EXCEL format

4: **SDGX97.xls** Total-digestion analyses of mineralized rock samples
by

ICP-AES: EXCEL format

5: **SDPL97.xls** Analyses of passive leach solutions (1997) by ICP-MS:
EXCEL format

6: **SDTL97.xls** Analyses of EPA-1312 (SPLP) solutions by ICP-AES:
EXCEL format

**7: SDPL99.xls** Analyses of passive leach solutions (1999) by ICP-MS:
EXCEL format

8: **QAQC.xls** Compilation of analytical qc data: EXCEL format

Note: When linking to an Excel file, your web browser will launch Excel,
which will automatically open the referenced file. To return to the text
file, use the browser's "back" button. This will return you to the first
page of the text file.

## Table of Contents 

Introduction 1

Sampling Methods 3

Sample Preparation 3

Analytical Methods 3

Discussion of EPA-1312 leach and passive leach results 5

Explanatory notes for Excel files of analytical results 6

References Cited 8

Figure 1. Map of Upper Animas Watershed study area, with mine-waste site
localities plotted, without labels. Coordinates and descriptions are
given in Table 1 2

Table 1. Sample Identification numbers, list of EXCEL files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions. This is the same table as contained in the
Excel file SDSITE.xls 10

## INTRODUCTION

This report provides analytical results for samples of mine dumps, mill
tailings, and some unmined altered rocks. The analyses are intended to
be used to characterize mineralized rocks in the Upper Animas River
watershed. This study represents one component in the U.S. Geological
Survey (USGS) program of integrated
geological-hydrological-biological-chemical studies underway in the
Upper Animas River watershed as part of the Abandoned Mine Lands
Initiative (AMLI) to provide Federal land management agencies a
scientific rationale for cost-effective restoration of public lands
affected by historic mining (Buxton and others, 1997; Nimick and von
Guerard, 1998). Information reported here is part of the mine site, or
metal source, component of the project. Other personnel on the AMLI team
are investigating diverse aspects of geology, geochemistry, hydrology,
and biology that are pertinent to establishing pre-mining and existing
conditions, as well as attainable reclamation goals.

Field studies in the summers of 1997 and 1998 focussed chiefly on
historic mines and prospects identified by others as being partly or
entirely on public lands administered by the U.S. Bureau of Land
Management (BLM) or the USDA-Forest Service (USFS); a limited number of
sites on private property were studied for comparison when the owner
provided access and permission to sample. Previous reports (Nash, 1999a;
1999b) presented interim recommendations for establishing priorities or
rankings of mine sites for removal or remediation. These two reports,
OFR-99-170 and OFR-99-323, have been included in Nash (2000), a CD-ROM
compilation of descriptions and photos of mines, mine waste dumps,
mills, and mill tailings and interim interpretations of their
significance as sources of acid or metals in the upper Animas River
watershed.

Acknowledgements: Many people with the BLM and USGS have been helpful
during this study, in particular Barbara Hite, Stephanie Odell, and Rob
Robinson of the BLM, and Daryl Gussey of the USFS. They have provided
helpful information and suggestions. The friendly advice of the many
scientists on the USGS AMLI team has expanded the breadth and depth of
our geochemical investigations, but the authors are solely responsible
for any errors reported here.

## METHODS OF STUDY

Field and laboratory studies for this investigation utilized methods
that were developed for the AMLI program, and efforts have been made to
maintain consistency among the scientists working in the Colorado
(Animas watershed) and Montana (Boulder River watershed) study areas. In
the Upper Animas study area, sites were first selected for study using
information gathered by previous investigators who had made inventories
for the BLM (Hite, 1995) or U.S. Forest Service (Lovekin and others,
1997). Because of the limited amount of field time available in 1997 and
1998, and the large number of potential sites, we focussed on sites that
were reasonably accessible, within two miles of major streams, and had
waste piles or dumps larger than about 70 cubic yards. Of the more than
500 sites identified by previous investigators, the majority are smaller
than 70

![](media/image2.png){width="7.102083333333334in"
height="6.704861111111111in"}

cubic yards, and were considered unlikely to be significant contributors
to water quality problems in the watershed (Nash, 1999a; 1999b). These
sites were not sampled and are not included in this study. Site
localities were identified on USGS 1:24,000 topographic

maps and recorded using a standard global position system (GPS)
instrument with an estimated accuracy of 100 meters (based on real
tests). Figure 1 shows the upper Animas Basin study area with the
localities of mine dumps sampled. The coordinates and sample names are
given in the Excel file SDSITE.xls, and Table 1 of this text.

### Sampling Methods

On-site work included a brief description of the site, rock types, rock
alteration and ore mineralogy, a measurement or estimate of size of the
dump pile, and the collection of a representative sample of the entire
dump or waste pile surface. Samples of waste-rock from mine dumps were
taken from more than 150 inactive mine sites in the upper Animas River
study area. Material was collected from 30 or more subcells, each having
an area of about one half square meter, across the top and sides of the
dumps to a depth of about 5 cm using four to six randomly selected 50-80
g scoops. The material was mixed, and a portion passed through a 2-mm
sieve to yield about 100 g from each subcell. The minus-2 mm fraction
was saved, as this was deemed to be the most reactive to water in
short-term exposures (Desborough and Fey, 1997; Nash, 1999a; 1999b;
Smith and others, 2000). The composite sample, split from the total
sieved material, amounted to one to two kg.

Samples with field numbers starting with 97ABS were collected by Fey,
those starting with A97W were collected by Desborough, and those
starting with NA were collected by Nash. In the series of samples
collected by Nash, the third letter indicates the type of material: D,
dump; F, iron flocculate-dominated sample; H, drill hole cuttings; G,
smelter slag; R, unmined altered rock; S, soil; and T, mill tailing.
Unless otherwise noted, all dump samples were sieved to minus-2 mm.
Information on the sample sites, their localities, and which sample
analyses are contained in which data spreadsheet are in an Excel
spreadsheet labeled SDSITE.xls that can be read by most spreadsheet
programs. Not all samples were subjected to the complete suite of
analytical chemistry methodology. This information is also in Table 1 of
this text.

#### 

#### **Sample Preparation**

In the laboratory, the composite samples were dried at 40^o^ C, split
with a Jones splitter, and recombined several times to achieve thorough
mixing. Splits from the homogenized material were made for: 1) ICP-AES
total-digestion analysis, 2) EPA-1312 leach test, 3) passive leach test,
and 4) net acid production (NAP) test. Splits for the EPA-1312 leach and
the passive leach did not require further preparation; splits for
total-digestion analysis and for NAP measurements were ground in a
vertical pulverizer with ceramic plates to minus-200-mesh (75 microns).

### Analytical Methods

Total-digestion ICP-AES analysis for 30 elements

A 0.2 g. portion of minus-200-mesh material was subjected to a
mixed-acid total digestion using HCl, HNO~3~, HCLO~4~ and HF acids
(Briggs, 1996). The resulting solution was analyzed for 40 elements
using inductively coupled-plasma atomic emission spectroscopy (ICP-AES);
30 elements are reported in this report. This analysis was performed on
samples collected in 1997, but not on later samples. The analytical
results are contained in the spreadsheet program SDGX97.xls.

EPA-1312 Leach Method *(Synthetic Precipitation Leach Procedure-SPLP)*

A 100-g. sample of mine waste was placed in a 2.3L polyethylene bottle.
Two liters of extract solution were added, resulting in a 1:20
sample/extract ratio, with 300 cc of head space. The SPLP method
mandates that an extract solution of pH 4.2 be used on soils from east
of the Mississippi River, and solution with pH of 5.0 be used on soils
from west of the Mississippi River, and the more acidic pH 4.2 solution
be used on mine-waste material. Because all of these samples were mine
waste or altered rock, we used the pH 4.2 extract solution. The extract
solution was made from de-ionized water acidified to a pH of 4.2 with a
one percent solution of 60/40 H2SO~4~/HNO~3~. The capped bottles were
placed on an end-over-end (tumbling) rotating agitator at 30 rpm for 18
hours. The leachates were then pressure-filtered through a 142 mm
diameter-0.7 micron glass-fiber filter (US-EPA, 1986). A 100 mL aliquot
of filtered solution was acidified with ultra-pure HNO~3~ for analysis
for 25 elements by ICP-AES (Briggs and Fey, 1996) and for sulfate by
ICP-AES as sulfur. Conductivity and pH were determined on the bulk
filtered leachate. This leach and analysis was performed on samples
collected in 1997, but not on later samples. The analytical results for
the EPA-1312 (SPLP) leach are contained in the spreadsheet program
SDTL97.xls.

Passive Leach Method

A 100-g. sample of mine waste was exposed to 2L of laboratory de-ionized
water (pH of 5.0 0.2) in an open 4L beaker. Samples were left at rest
for one hour, and then gently stirred for five seconds to prevent
stratification of the leachate. The pH of the the leachate of the 1997
samples, and the pH and conductivity of the leachate of the 1999 samples
was (were) measured after 24 hours. A 60 mL aliquot was then filtered
through a Gelman 0.45-micron filter using a disposable syringe
(Desborough and Fey, 1997), acidified with ultra-pure HNO~3~, and
refrigerated prior to analysis by inductively coupled-plasma-mass
spectroscopy (ICP-MS).

Filtered, acidified solutions from the passive leach tests were analyzed
by ICP-MS because this method provides information on more than 40
elements of possible interest, with good results to one part per billion
(ppb, or microgram per liter), or lower for some elements (Crock and
others, 1999). All of the samples of this study were subjected to the
passive leach test. Samples collected in 1997 and processed in 1998 were
analyzed by a commercial laboratory (results contained in spreadsheet
file SDPL97.xls). This file also contains pH but not conductivity
measurements of the passive leach solutions. Samples collected in 1998
and processed in 1999 were analyzed with a similar instrument in the
USGS laboratories in Lakewood, Colorado (results contained in
spreadsheet file SDPL99.xls). This file includes pH and conductivity
measurements of the passive leach solutions. Replicate samples and
standards were submitted with the leachates to evaluate precision and
quality control.

Results of ICP-MS analyses of leachate solutions are best considered
semi-quantitative, as is well understood by geochemists who routinely
use this method for solutions of highly variable composition. As
demonstrated by Fey and others (1999), data from analyses of leachates
are inherently less reproducible than those from total digestion
analyses. Our laboratory-produced solutions span a wide range in pH,
conductivity, and elemental composition, and one should not expect
precision to be constant across five orders of magnitude of
concentration. For base metals such as copper, lead, and zinc, the
precision is about 20 percent for solutions whose concentrations
resemble typical surface waters; the precision is lower for solutions
whose concentrations are 1,000 times or more higher than normal surface
waters. High and very high concentrations are clearly delineated from
low concentrations, and the semi-quantitative nature of the results is
appropriate for these tests. The file QAQC.xls included in this report
presents data for duplicates, blanks, and standards for the ICP-40
element method, the EPA-1312 method, and the passive leach method.
Further comments are made elsewhere (Nash, 1999a; 1999b).

Net Acid Production (NAP) method

A 1.0-gram sample of pulverized, minus-200-mesh material was digested
with a solution of 30 percent hydrogen peroxide to oxidize pyrite,
thereby producing sulfuric acid (Lapakko and Lawrence, 1993). This
acidic solution reacted with the bulk of the sample, released additional
acidity from water-soluble acid salts (such as iron-sulfates), and
reacted with acid-consuming minerals such as carbonates, and some
non-carbonates (e.g. biotite, chlorite and epidote). The solutions were
heated for one hour, cooled, and filtered. The acidic filtrate was then
titrated to a pH of 7 with 0.1M NaOH. A calculated net acid production
(NAP) is expressed in terms of kg-equivalent CaCO~3~ per metric ton of
mine waste. This NAP is meant to represent the net long-term or total
potential of a material to produce acid over an unspecified period of
weathering. This test was applied to samples collected in 1997, and the
results are contained in the same spreadsheet file as the EPA-1312 leach
analyses, SDTL97.xls.

X-ray diffraction (XRD) studies

X-ray diffraction studies were made to determine major minerals in the
minus-2 mm sample material. Detailed results of the XRD studies are not
presented here, but a summary indicates that sulfide minerals are common
in these samples: 25 percent of the samples contain pyrite (FeS~2~), 30
percent contain sphalerite (ZnS), and 30 percent contain galena (PbS).
Calcite (CaCO~3~), an important acid-buffering phase, was detected by
XRD in only three samples.

## DISCUSSION OF EPA-1312 (SPLP) LEACH AND PASSIVE LEACH RESULTS

A comparison between the results of the EPA-1312 leach and the passive
leach is reported in Fey and others (2000), which discussed the EPA-1312
leach and the passive leach and their application to the same samples as
those from 1997 in this report, plus eighteen mine-waste samples from
Montana. In figure 1 of Fey and others (2000), the pH of the passive
leach was plotted versus the pH of the EPA-1312 leach. The data points
cluster quite closely around a diagonal line of 1 to 1 correspondence.
The same is true for many of the trace elements presented in the tables
of this report. We applied both leach procedures to samples collected in
1997 (files SDTL97.xls and SDPL97.xls). However, we did not apply the
EPA-1312 leach to the later samples, because using the passive leach
procedure is simpler and faster, yields similar results, and more
closely simulates the processes that occur at the surface of waste piles
exposed to rainwater and snowmelt runoff. (Fey and others, 2000).

The relation between the net acid production (NAP) and the sum of
dissolved metals As+Cd+Cu+Pb+Zn (in g/L) from the EPA-1312 leach has
also been examined (Fey and others, 2000). The mine wastes studied can
be segregated into groups based on their NAP and summed metals, where
samples with NAP greater than 10 kg CaCO~3~ per ton and the above summed
metals greater than 5,000 g/L would rank as having the greatest
potential for causing water quality problems. The passive leach samples
discussed in Fey and others (2000) also exhibit a systematic
relationship between summed metals and NAP. Although the passive leach
releases a lower concentration of metals, a similar grouping of the
waste samples results. Here, the group with greatest potential for
causing water quality problems (highest rank) have NAP greater than 10
CaCO~3~ and summed metals greater than 3,000 g/L. We did not determine
the NAP for the later samples, but did perform the passive leach on all
samples in this report, and so some measure of ranking can be achieved
by using the 3,000 g/L value for the sum of the metals As+Cd+Cu+Pb+Zn in
the passive leach solutions. Dissolved iron in the EPA-1312 solutions
can also be used to delineate wastes with high potential for water
quality degradation. A value of 1,000 g/L iron in leach solutions can be
used to separate the samples, for reasons also discussed in Fey and
others (2000).

## EXPLANATORY NOTES FOR FILES OF ANALYTICAL RESULTS

1.  In the file SDPL97.xls, the number of figures carried in the
    spreadsheet tends to exceed the significant figures reported by the
    analyst. In most cases, only two figures are significant. The other
    spreadsheet files have been formatted to present the correct number
    of significant figures.

2.  In all files, additional elements may have been determined but not
    reported here because the results were either at or below the limit
    of determination (e.g. Cr and Ti in leachates), or the element is
    not being used in the geochemical characterization of the watershed.

3.  Explanations for each specific file are included in notes found at
    the bottom of each file, below the analytical data. Especially
    important are the extra characters attached to some field numbers in
    the file SDPL99.xls, which indicate that additional or unusual steps
    were taken in the passive leach of those samples. Some samples were
    leached for more than the standard 24 hour period. Those sample
    leachates carry extra letters including: B, 48 hour leach period; C,
    72 hours; D, 96 hours; G, 168 hours. Some solutions were collected
    using different filtering techniques. The extra character U
    indicates the leachate was not filtered prior to analysis, and a V
    indicates the leachate was filtered through a 0.1 micrometer filter
    instead of the usual 0.45 micrometer filter. The extra character Y
    or X indicates a replicate analysis. Other letter suffixes (e.g. F,
    L, P, R, S) refer to sample field attributes, and can be ignored.

4.  In the file SDSITE.xls, sample locations shown were mostly
    determined by standard GPS (global positioning satellite), with no
    subsequent corrections. Some site locations were determined from
    USGS 1:24,000 topographic maps where the GPS could not operate.
    Field tests show that the GPS is accurate to about 100 meters in the
    San Juan mountains.

**References Cited**

Briggs, P.H., 1996, Forty elements by inductively coupled plasma-atomic
emission spectrometry, *in* Arbogast, B.F., ed., Analytical methods
manual for the Mineral Resource Surveys Program, U.S. Geological Survey
Open-File Report 96-525, p. 77-94.

Briggs, P.H., and Fey, D.L., 1996, Twenty-four elements in natural and
acid mine waters by inductively coupled plasma-atomic emission
spectrometry, *in* Arbogast, B.F., ed., Analytical methods manual of the
Mineral Resource Surveys Program, U.S. Geological Survey Open-File
Report 96-525, p. 95-101.

Buxton, H.T., Nimick, D.A., and others, 1997, A science-based, watershed
strategy to support effect remediation of abandoned mine lands:
Proceedings of the Fourth International Conference on Acid Rock
Drainage, Vancouver, B.C., p. 1869-1880.

Crock, J.G., Arbogast, B.F., and Lamothe, P.J., 1999, Laboratory methods
for the analysis of environmental samples, *in* G.S. Plumlee and M.J.
Logsdon, eds., The Environmental Geochemistry of Mineral Deposits, part
A: Society of Economic Geologists, Rviews in Economic Geology, vol. 6A,
p. 265-287.

Desborough, G.A., and Fey, D.L., 1997, Preliminary characterization of
acid-generating potential and toxic metal solubility of some abandoned
metal-mining related wastes in the Boulder River headwaters, northern
Jefferson County, Montana: U.S. Geological Survey Open-File Report
97-478, 21 p.

Fey, D.L., Unruh, D.M., and Church, S.E., 1999, Chemical data and lead
isotopic composition in stream-sediment samples from the Boulder River
watershed, Jefferson County, Montana: U.S. Geological Survey Open-File
Report 99-575, 147 p.

Fey, D.L., Desborough, G.A., and Church, S.E., 2000, Comparison of two
leach procedures applied to metal-mining related wastes in Colorado and
Montana and a relative ranking method for mine wastes, in Proceedings of
the Fifth International Conference on Acid Rock Drainage, May 20-23,
2000, Denver, Colorado, Society of Mining Engineering, Lakewood, Colo.,
p. 1477-1487.

Hite, B.J., 1995, Abandoned mine land inventory of BLM Administered land
in Upper Animas River watershed, Colorado: U.S. Bureau of Mines, report
for Colorado State BLM Office, 15 p. plus appendices; data for 304 sites
on diskette.

Lapakko, K., and Lawrence, L.W., 1993, Modification of the net acid
production (NAP) test. Paper presented at the Seventeenth Annual British
Columbia Mine Reclamation Symposium, May 4-7 at Port Hardy, B.C.

Lovekin, J.R., Satre, M.J., Sheriff, W.M., and Sares, M.A., 1997,
USFS-Abandoned mine land inventory project final summary report, San
Juan National Forest, Columbine Ranger District: Colorado Geological
Survey, 45 p. plus tables.

Nash, J. T., 1999a, Geochemical investigations and interim
recommendations for priority abandoned mine sites on U.S.D.A. Forest
Service lands, Mineral Creek watershed, San Juan County, Colorado; paper
edition: U.S. Geological Survey Open-File Report 99-170, 40 p.

Nash, J.T., 1999b, Geochemical investigations and interim
recommendations for priority abandoned mine sites on USBLM lands, Upper
Animas River watershed, San Juan County, Colorado; paper edition: U.S.
Geological Survey Open-File Report 99-323, 45 p.

Nash, J.T., 2000, Geochemical studies of mines, dumps, and tailings as
sources of contamination, Upper Animas River Watershed, Colorado, U.S.
Geological Survey Open-File Report 00-104, CD-ROM

Nimick, D. A., and von Guerard, Paul, 1998, editors, Science for
Watershed Decisions on Abandoned Mine Lands: Review of Preliminary
Results, Denver, Colorado, February 4-5, 1998: U.S. Geological Survey
Open-File Report 98-297, 70 p.

Smith, K.S., Ramsey, C.A., and Hageman, P.L., 2000, Sampling strategy
for the rapid screening of mine-waste dumps on abandoned mine lands, in
Proceedings of the Fifth International Conference on Acid Rock Drainage,
May 20-23, 2000, Denver, Colorado, Society of Mining Engineering,
Lakewood, Colo., p 1456-1462.

U.S. Environmental Protection Agency, 1986, [Test Methods for Evaluating
Solid Waste]{.underline}, Vol. I and II (SW-846) 3^rd^ Edition,
November. Updates are available through Revision 2B, published April 4,
1995.

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions

  ---------- ---------- ---------- ---------- ---------- ------------ -------------- --------------- ----------- ----------------------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                           

             **SD**     **SD**     **SD**     **SD**     **Name or**  **Latitude**   **Longitude**   **Size**    

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM site   **N (deg)**    **W (deg)**     **Est.      **Site and/or sample description**
  ID**                                                   \#**                                        Tons**      

  97ABS101   x          x          x                     B060         37.8356        107.6858        \>50,000    Lower level, tan, high clay, low sulfide

  97ABS102   x          x          x                     B060         37.8358        107.6864        \>50,000    Upper level, tan, high clay, med pyrite

  97ABS103   x          x          x                     \--          37.8233        107.6656        100         Small dump, weakly mineralized volcanics

  97ABS104   x          x          x                     B160         37.8131        107.6444        5,000       Gray, weakly altered volcanics, wet by
                                                                                                                 mine drain

  97ABS105   x          x          x                     B070         37.8083        107.6650        5,000       Tan and green weakly mineralized
                                                                                                                 volcanics

  97ABS106   x          x          x                     B248         37.8117        107.6939        nd          Red-ocher altered, high pyrite, mixed
                                                                                                                 talus

  97ABS107   x          x          x                     \--          37.8672        107.6839        2,000       High pyrite waste from shaft,
                                                                                                                 galena-sphalerite

  97ABS108   x          x          x                     \--          37.8656        107.6811        10,000      High sulfide pyrite-galena-sphalerite
                                                                                                                 from adit

  97ABS109   x          x          x                     \--          37.8678        107.6750        10,000      Rusty stained low sulfide dump; high
                                                                                                                 flow drainage

  97ABS110   x          x          x                     \--          37.7872        107.6233        \>50,000    Dark manganese-stained, oxides, some
                                                                                                                 pyrite-chalcopyrite

  97ABS111   x          x          x                     \--          37.7942        107.6356        2,000       Oxides of iron-mangangese-copper, low
                                                                                                                 pyrite

  97ABS112   x          x          x                     Bonner       37.8431        107.7383        \>50,000    Tan altered volcanics, medium pyrite,
                                                                                                                 some sphalerite

  97ABS260   x          x          x                     Ferricrete   37.8683        107.7269        500         Iron-oxide cemented talus, no sulfides;
                                                         mine                                                    wet

  97ABS261   x          x          x                     \--          37.8672        107.7275        \>5,000     Ocher ferricrete, friable, trenched

  97ABS262   x          x          x                     \--          37.8497        107.7258        2,000       Brown iron-oxide coated weakly altered
                                                                                                                 volcanics, no pyrite

  97ABS263   x          x          x                     Imogene      37.8622        107.7292        15,000      Rusty iron-oxide coatings, low pyrite;
                                                                                                                 wet

  97ABS264   x          x          x                     Silver Crown 37.8717        107.8111        20,000      High sulfide-pyrite-galena-sphalerite,
                                                                                                                 medium clay, wet by mine drain

  A97W001    x          x          x                     Carbon Lake  37.8977        107.7163        12,000      High pyrite-galena-sphalerite, enargite;
                                                                                                                 wet

  A97W002    x          x          x                     Congress     37.8861        107.7023        7,000       High sulfide, high clay, inhomogeneous

  A97W003    x          x          x                     \--          37.8910        107.7066        2,500       High sulfide, high clay dump

  A97W004    x          x          x                     \--          37.8915        107.7102        \<500       Sulfidic dump from prospect

  NAD084     x          x          x                     \--          37.9036        107.5564        \--         Private; high pyrite dump, makes yellow
                                                                                                                 sulfates

  NAD085     x          x          x                     B144         37.8961        107.6144        1,000       High
                                                                                                                 pyrite-galena-sphalerite-chalcopyrite,
                                                                                                                 weathers yellow; high clay

  NAD086     x          x          x                     B152         37.8044        107.5983        20,000      Sulfidic granitic rocks,
                                                                                                                 galena-sphalerite, is unusual

  NAD089     x          x          x                     \--          37.8244        107.5864        \>100,000   Private; medium
                                                                                                                 pyrite-galena-sphalerite, ore pile?

  NAD090     x          x          x                     B156         37.8658        107.5667        2,000       Messy mine drainage makes iron
                                                                                                                 flocculate

  NAD091     x          x          x                     \--          37.8792        107.6728        10,000      Messy mine drainage, much red iron
                                                                                                                 flocculate

  NAD092     x          x          x                     B052         37.8914        107.6789        500         Only part mine dump, is high sulfide;
                                                                                                                 debris
  ---------- ---------- ---------- ---------- ---------- ------------ -------------- --------------- ----------- ----------------------------------------

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions (cont.)

  ---------- ---------- ---------- ---------- ---------- -------- -------------- --------------- ---------- ---------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                      

             **SD**     **SD**     **SD**     **SD**     **Name   **Latitude**   **Longitude**   **Size**   
                                                         or**                                               

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM    **N (deg)**    **W (deg)**     **Est.     **Site and/or sample
  ID**                                                   site                                    Tons**     description**
                                                         \#**                                               

  NAD094A    x          x          x                     \--      37.8922        107.6808        10,000     Lark lower, medium-high
                                                                                                            sulfide, galena-sphalerite

  NAD094B    x          x          x                     B072     37.8944        107.6806        100,000    Lark upper level, alluvium
                                                                                                            and high sulfide

  NAD095     x          x          x                     B021     37.9014        107.6700        300        Very high pyrite, some
                                                                                                            galena-sphalerite, water in
                                                                                                            shaft

  NAD096     x          x          x                     B123     37.9103        107.6306        30,000     Big dump, high
                                                                                                            pyrite-galena-sphalerite,
                                                                                                            drain through dump

  NAD098     x          x          x                     B234     37.9519        107.5833        3,000      Very high sulfide, big
                                                                                                            vein; water in trenches

  NAD099     x          x          x                     \--      37.9428        107.5344        2,000      Oxidized, high quartz,
                                                                                                            small dump

  NAD121     x          x          x                     B088     37.9336        107.5972        2,000      Dump from adit; high clay,
                                                                                                            medium sulfide

  NAD123     x          x          x          x          B213     37.9286        107.5864        1,000      High clay and black
                                                                                                            manganese, medium
                                                                                                            pyrite-sulfide dump, small

  NAD132                                      x          B229     37.9264        107.5697        1,000      Mostly green-gray altered
                                                                                                            volcanic rock, background?

  NAD134     x          x          x                     B183     37.9428        107.5344        2,000      Oxidized, high quartz,
                                                                                                            small dump

  NAD137     x          x          x                     B184     37.9417        107.5386        7,000      Yellow sulfate from
                                                                                                            weathering, high silica

  NAD142     x          x          x                     B182     37.9322        107.5644        6,000      High quartz-carbonate
                                                                                                            (tan), low sulfide

  NAD144     x          x          x                     B169     37.9400        107.5722        3,000      Coarse abundant
                                                                                                            pyrite-quartz, some mine
                                                                                                            drainage

  NAD146     x          x          x                     B236     37.9494        107.5861        \<100      Abundant pyrite and
                                                                                                            sulfate, big quartz veins

  NAD148     x          x          x                     \--      37.9461        107.5889        8,000      Stockpile? High
                                                                                                            pyrite-galena-sphalerite;
                                                                                                            looks like ore pile

  NAD149     x          x          x                     \--      37.9483        107.5839        10,000     High pyrite-sericite
                                                                                                            altered volcanics; coarse
                                                                                                            quartz

  NAD150     x          x          x                     B238     37.9450        107.5828        12,000     Pyrite-clay rich, some
                                                                                                            galena-sphalerite; adit on
                                                                                                            large vein

  NAD151     x          x          x          x          B237     37.9461        107.5789        2,000      Coarse pyrite with clay,
                                                                                                            big quartz-pyrite vein
                                                                                                            chunks, small dump

  NAD155     x          x          x                     B234     37.9519        107.5833        3,000      Very high sulfide, big
                                                                                                            vein; water in trenches

  NAD160     x          x          x                     B233     37.9550        107.5783        5,000      High sulfide, coarse
                                                                                                            pyrite; some mine drainage

  NAD166                                      x          \--      37.9158        107.5642        \<1,000    Mostly green altered
                                                                                                            volcanics; background?

  NAD167     x          x          x                     B180     37.9147        107.5542        5,000      Mixed oxidized sulfide and
                                                                                                            green altered volcanics

  NAD172                                      x          B120     37.9222        107.6328        \<100      Very small but high sulfide

  NAD175     x          x          x          x          B123     37.9103        107.6306        30,000     Big dump, high
                                                                                                            pyrite-galena-sphalerite,
                                                                                                            clay, drain through dump
  ---------- ---------- ---------- ---------- ---------- -------- -------------- --------------- ---------- ---------------------------

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions (cont.)

  ---------- ---------- ---------- ---------- ---------- ---------- -------------- --------------- ----------- ---------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                         

             **SD**     **SD**     **SD**     **SD**     **Name     **Latitude**   **Longitude**   **Size**    
                                                         or**                                                  

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM site **N (deg)**    **W (deg)**     **Est.      **Site and/or sample
  ID**                                                   \#**                                      Tons**      description**

  NAD177                                      x          B010       37.9036        107.6606        \<100       Mostly pyrite-sericite
                                                                                                               altered volcanics;
                                                                                                               background?

  NAD181     x          x          x                     \--        37.9069        107.6608        4,000       High sulfide dump near lake
                                                                                                               at pass, clay?

  NAD184     x          x          x                     \--        37.8981        107.6467        3,000       Mixed high pyrite and low
                                                                                                               pyrite waste; tram

  NAD187     x          x          x                     B006       37.9028        107.6631        500         Small, pyrite-altered
                                                                                                               volcanics, any ore?

  NAD192     x          x          x                     B021       37.9014        107.6700        300         Very high pyrite, some
                                                                                                               galena-sphalerite, water in
                                                                                                               shaft

  NAD196     x          x          x                     B103       37.8892        107.6689        800         Coarse pyrite-quartz veins,
                                                                                                               steep avalanche path

  NAD201     x          x          x                     B105       37.8881        107.6650        200         Low sulfide, high
                                                                                                               iron-oxide on dump,
                                                                                                               ferricrete

  NAD204     x          x          x                     B072       37.8944        107.6806        100,000     Lark upper level, alluvium
                                                                                                               and high sulfide

  NAD210     x          x          x                     \--        37.8922        107.6808        10,000      Lark lower, medium-high
                                                                                                               sulfide, galena-sphalerite

  NAD211     x          x          x          x          \--        37.8922        107.6808        10,000      High
                                                                                                               pyrite-sphalerite-galena,
                                                                                                               fresh, few fines; sulfide
                                                                                                               picks

  NAD216     x          x          x                     \--        37.8914        107.6828        100,000     High sulfide, high clay,
                                                                                                               weathered?, large

  NAD218     x          x          x                     B052       37.8914        107.6789        500         Only part mine dump, is
                                                                                                               high sulfide; debris

  NAD219     x          x          x                     B053       37.8931        107.6761        \<100       Small diggings, oxidized
                                                                                                               sulfides

  NAD221     x          x          x                     B271       37.8886        107.6789        5,000       Recent mining, low pyrite,
                                                                                                               slides into creek

  NAD225     x          x          x                     B001       37.8792        107.6728        10,000      Messy mine drainage, much
                                                                                                               red iron flocculate

  NAD227     x          x          x                     \--        37.8792        107.6728        10,000      High pyrite part of dump,
                                                                                                               atypical sample

  NAD227P                                     x          \--        37.8792        107.6728        10,000      Sulfidic picks from mostly
                                                                                                               oxide dump

  NAD231     x          x          x                     B156       37.8658        107.5667        2,000       Messy mine drainage makes
                                                                                                               iron flocculate

  NAD235     x          x          x                     B022       37.8653        107.5381        12,000      Low sulfide gray rocks, wet
                                                                                                               by mine drainage

  NAD237     x          x          x                     B157       37.8672        107.5478        10,000      Yellow sulfate colors on
                                                                                                               high pyrite waste,
                                                                                                               galena-sphalerite

  NAD249     x          x          x                     B127       37.8572        107.5742        1,500       Overgrown, variable
                                                                                                               sulfide, some water

  NAD252     x          x          x                     \--        37.8231        107.5853        \>100,000   Private; oxide-sulfide-clay
                                                                                                               mix

  NAD253     x          x          x                     \--        37.8244        107.5864        \>100,000   Private; medium
                                                                                                               pyrite-galena-sphalerite,
                                                                                                               ore pile?

  NAD254     x          x          x                     \--        37.8244        107.5856        \>100,000   Private; low sulfide,
                                                                                                               wallrock only?

  NAD262     x          x          x                     Highland   37.7844        107.5839        \>100,000   Clay-altered volcanics,
                                                         Mary                                                  calcite veins

  NAD265     x          x          x                     \--        37.7828        107.5806        10,000      Altered pre-Cambrian
                                                                                                               amphibolite, calcite veins

  NAD286                                      x          \--        37.8061        107.5992        2,000       Quartz-sulfide vein, old
                                                                                                               mine, calcite, -2 mm
  ---------- ---------- ---------- ---------- ---------- ---------- -------------- --------------- ----------- ---------------------------

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions (cont.)

  ---------- ---------- ---------- ---------- ---------- -------- -------------- --------------- ----------- ----------------------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                       

             **SD**     **SD**     **SD**     **SD**     **Name   **Latitude**   **Longitude**   **Size**    
                                                         or**                                                

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM    **N (deg)**    **W (deg)**     **Est.      **Site and/or sample description**
  ID**                                                   site                                    Tons**      
                                                         \#**                                                

  NAD298     x          x          x                     B152     37.8044        107.5983        20,000      Sulfidic granitic rocks,
                                                                                                             galena-sphalerite, is unusual

  NAD300     x          x          x                     B248     37.8108        107.6856        5,000       Highly altered rocks, high pyrite, mixed
                                                                                                             talus and dump

  NAD308     x          x          x                     B108     37.8722        107.6719        1,500       Gray volcanics, low pyrite, some
                                                                                                             iron-oxide, small

  NAD309     x          x          x                     B116     37.8722        107.6678        1,500       Dump is tan, oxide coatings, pyrite,
                                                                                                             mine water on dump

  NAD310     x          x          x                     B115     37.8728        107.6708        4,000       Gray volcanics, low sulfide, no Acid
                                                                                                             Rock Drainage (ARD)

  NAD311     x          x          x                     B009     37.8700        107.6747        3,000       Much ocher-red iron flocculate from Acid
                                                                                                             Mine Drainage (AMD)

  NAD320     x          x          x                     B262     37.8594        107.6872        3,000       Moderate pyrite, tan clays, AMD on dump

  NAD323     x          x          x                     \--      37.8603        107.6853        4,000       Sulfidic dump with yellow sulfates, high
                                                                                                             clay

  NAD327     x          x          x                     B114     37.8747        107.6878        8,000       Low pyrite, low iron-oxide, no ARD

  NAD339     x          x          x                     B144     37.8961        107.6144        1,000       High
                                                                                                             pyrite-galena-sphalerite-chalcopyrite,
                                                                                                             weathers yellow; high clay

  NAD347     x          x          x                     B149     37.8919        107.6033        600         Mix of sulfidic and green altered
                                                                                                             volcanics

  NAD351     x          x          x                     \--      37.8972        107.5403        \--         Klondyke; much black manganese, low
                                                                                                             iron-oxide, low pyrite

  NAD352     x          x          x                     \--      37.8992        107.5442        \--         Coarse pyrite-quartz veins, weathers
                                                                                                             yellow

  NAD353     x          x          x                     \--      37.9025        107.5411        \--         Coarse pyrite-galena-sphalerite, talus
                                                                                                             mixed in with dump

  NAD355     x          x          x                     \--      37.9036        107.5564        \--         Private; high pyrite dump, make yellow
                                                                                                             sulfates

  NAD357     x          x          x                     \--      37.9044        107.5561        \--         Private; upper dump like NAD355.

  NAD361     x          x          x                     \--      37.8103        107.6053        \--         Private; mostly green altered volcanics,
                                                                                                             some quartz

  NAD362     x          x          x                     \--      37.8139        107.6039        \--         Private, small; mixed pyrite and yellow
                                                                                                             sulfates

  NAD364     x          x          x                     B160     37.8919        107.6033        5,000       Tan dump, high clay, high water flow, no
                                                                                                             ARD

  NAD365     x          x          x                     \--      37.8142        107.6517        \--         Stockpile at mill; high pyrite ore (?)

  NAD380     x          x          x                     B318     37.9078        107.5656        10,000      Recent mining; low sulfide dump

  NAD381                                      x          \--      37.9331        107.6058        500         Stockpile, rich in
                                                                                                             sphalerite-galena-pyrite

  NAD387                                      x          \--      37.8969        107.5589        10,000      Sulfidic part of dump, chunks?

  NAD396     x          x          x                     B249     37.9319        107.6056        1,000       Upper dump, moderate pyrite-ocher oxides

  NAD399     x          x          x                     \--      37.7869        107.8003        \>100,000   Gray siltite, oxide coatings, low
                                                                                                             sulfide
  ---------- ---------- ---------- ---------- ---------- -------- -------------- --------------- ----------- ----------------------------------------

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions (cont.)

  ---------- ---------- ---------- ---------- ---------- ---------- -------------- --------------- ---------- ---------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                        

             **SD**     **SD**     **SD**     **SD**     **Name     **Latitude**   **Longitude**   **Size**   
                                                         or**                                                 

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM site **N (deg)**    **W (deg)**     **Est.     **Site and/or sample
  ID**                                                   \#**                                      Tons**     description**

  NAD414     x          x          x                     \--        37.8494        107.6764        \--        Private; high
                                                                                                              pyrite-galena-sphalerite
                                                                                                              dump, high clay

  NAD423     x          x          x                     \--        37.8561        107.7208        500        Quartz-pyrite-sericite
                                                                                                              altered rocks, moderate
                                                                                                              sulfides

  NAD427     x          x          x                     \--        37.8747        107.7325        5,000      Rusty altered rocks, low
                                                                                                              sulfide?, much mine water

  NAD501                                      x          \--        37.8653        107.7072        300        Yellow, high clay, pyritic
                                                                                                              dump

  NAD504                                      x          \--        37.8639        107.7169        500        Sulfidic waste from old
                                                                                                              shaft, bulldozed

  NAD511                                      x          Imogene    37.8622        107.7286        10,000     Gray silicic volcanics,
                                                                                                              iron-oxide coatings, low
                                                                                                              pyrite

  NAD516                                      x          Bonner     37.8431        107.7383        10,000     Middle dump, low pyrite,
                                                                                                              silicic volcanics,
                                                                                                              iron-oxide

  NAD517                                      x          Bonner     37.8436        107.7383        10,000     Lower dump, low pyrite,
                                                                                                              high iron-oxide matrix

  NAD519                                      x          West       37.8444        107.7403        7,500      West of Bonner, low pyrite,
                                                         Bonner                                               high iron-oxide dump

  NAD520                                      x          Paradise   37.8425        107.7644        10,000     Paradise, low pyrite, high
                                                                                                              iron-oxide and white crust

  NAD524                                      x          Ruby Trust 37.8458        107.7528        20,000     High clay, medium pyrite,
                                                                                                              iron-oxide coatings on
                                                                                                              volcanic rocks

  NAD530                                      x          B123       37.9103        107.6306        30,000     High
                                                                                                              pyrite-sphalerite-galena;
                                                                                                              repeat sample

  NAD555                                      x          B116       37.8728        107.6675        1,600      Tan, low-medium pyrite,
                                                                                                              iron-oxide coatings

  NAD557                                      x                     37.8878        107.6842        500        Very high sulfide, fine
                                                                                                              grained in clay

  NAD563                                      x          N204       37.8928        107.6811        50,000     Upper Lark, on average is
                                                                                                              low sulfide with alluvium

  NAD564                                      x          N210       37.8925        107.6808        50,000     Lower Lark re-sample,
                                                                                                              medium sulfide,
                                                                                                              pyrite-sphalerite-galena

  NAD577                                      x          Silver     37.8717        107.7444        20,000     Waste rich in clay and fine
                                                         Crown                                                pyrite

  NAD588                                      x          Brooklyn   37.8722        107.6972        100,000    Gray dump, high in fine
                                                                                                              pyrite and clay

  NAD594                                      x          Bullion    37.8881        107.7422        30,000     Tan color, high clay and
                                                         King                                                 iron-oxide, fine pyrite
                                                                                                              inside

  NAD601                                      x          B152       37.8025        107.6797        20,000     Granitic rocks, medium
                                                                                                              pyrite, medium iron-oxide

  NAD603                                      x          Burbank    37.8189        107.7725        10,000     Green altered volcanics,
                                                                                                              oxide coatings

  NAD648                                      x          Bandora    37.7867        107.8011        50,000     Lower Bandora, tan siltite,
                                                                                                              iron-oxide coatings, low
                                                                                                              pyrite

  NAD650                                      x          Bandora    37.7875        107.8019        50,000     Upper dump, tan siltite,
                                                                                                              has low sulfide

  NAD696                                      x          NAD211     37.8925        107.6814        10,000     High sulfide dump, coarse,
                                                                                                              few fines; re-sample

  NAD726                                      x          B234       37.9517        107.5819        3,000      High pyrite dump, re-sample

  NAD817                                      x          \--        37.8608        107.7163        \>50,000   High
                                                                                                              pyrite-sphalerite-galena
                                                                                                              dump, high clay, recent

  NAD818                                      x          \--        37.8592        107.7013        10,000     High
                                                                                                              pyrite-sphalerite-galena
                                                                                                              dump, high clay, recent
  ---------- ---------- ---------- ---------- ---------- ---------- -------------- --------------- ---------- ---------------------------

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions (cont.)

  ---------- ---------- ---------- ---------- ---------- ---------- -------------- --------------- ---------- --------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                        

             **SD**     **SD**     **SD**     **SD**     **Name     **Latitude**   **Longitude**   **Size**   
                                                         or**                                                 

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM site **N (deg)**    **W (deg)**     **Est.     **Site and/or sample
  ID**                                                   \#**                                      Tons**     description**

  NAD845                                      x          B249       37.8525        107.5819        2,000      Ocher, mixed sulfide-oxide
                                                                                                              materials

  NAD878                                      x          B014       37.8653        107.6806        2,000      From adit, high
                                                                                                              pyrite-sphalerite-galena
                                                                                                              dump

  NAD879                                      x          B014       37.8650        107.6811        3,000      From shaft, very high
                                                                                                              pyrite, sphalerite-galena

  NADW520                                     x          Paradise   37.8425        107.7644        10,000     Mostly white crust on
                                                                                                              iron-oxide soil

  NAF520                                      x          Paradise   37.8425        107.7644        10,000     Mostly red and brown fine
                                                                                                              iron-oxide soil

  NAF521                                      x          Paradise   37.8419        107.7653        5,000      Fine red iron-oxide soil
                                                         West                                                 in matrix

  NAF687                                      x          \--        37.8783        107.6714                   Rusty brown iron-oxide
                                                                                                              from mine drainage

  NAG299     x          x          x                     \--        37.8078        107.6750        \--        Glassy black smelter slag,
                                                                                                              ground sand size

  NAH188                                      x          \--        37.9031        107.6669        na         Drill cuttings, high clay,
                                                                                                              high pyrite

  NAH189                                      x          \--        37.9033        107.6672        na         Drill cuttings, high clay,
                                                                                                              high pyrite

  NAH558                                      x          \--        37.8886        107.6844        na         Drill cuttings, high clay,
                                                                                                              high pyrite

  NAH559                                      x          \--        37.8892        107.6847        na         Drill cuttings, high clay,
                                                                                                              high pyrite, and oxides

  NAH560                                      x          \--        37.8894        107.6847        na         Drill cuttings, high
                                                                                                              pyrite and iron-oxide

  NAR130     x          x          x                     \--        37.9114        107.5967        \--        Red-black soil along
                                                                                                              quartz-sulfide vein, -2 mm

  NAR180     x          x          x                     \--        37.9044        107.6633        \--        Pyrite-jarosite altered
                                                                                                              volcanic, Red Mtn type, -2
                                                                                                              mm

  NAR190     x          x          x                     \--        37.9031        107.6669        \--        Drill cuttings in red
                                                                                                              altered volcanics, -2 mm

  NAR197                                      x          \--        37.8894        107.6672        na         Iron-oxide-pyrite altered
                                                                                                              volcanic rocks, -2 mm

  NAR205                                      x          \--        37.8950        107.6811        na         Rusty alluvium at Lark
                                                                                                              mine

  NAR207S    x          x          x                     \--        37.8983        107.6789        \--        Red soil from
                                                                                                              pyrite-altered volcanics,
                                                                                                              -2 mm

  NAR261     x          x          x                     \--        37.7831        107.5839        \--        Soil from gray
                                                                                                              clay-carbonate altered
                                                                                                              volcanics

  NAR301     x          x          x                     \--        37.8106        107.6861        \--        Red weathered
                                                                                                              pyrite-altered volcanics,
                                                                                                              -2 mm

  NAR366                                      x          B218       37.9078        107.5656        na         Small dump, mostly gray
                                                                                                              volcanics

  NAR391                                      x          B288       37.7981        107.5508        na         Mostly gray fresh
                                                                                                              volcanics, low pyrite

  NAR421     x          x          x                     \--        37.8186        107.6983        \--        Red pyrite-altered
                                                                                                              volcanics in County pit,
                                                                                                              -2 mm

  NAR603                                      x          \--        37.8189        107.7719        na         Green altered volcanic
                                                                                                              agglomerate

  NAR691                                      x          \--        37.8992        107.6789        na         Soil in red altered
                                                                                                              volcanics, from acid
                                                                                                              sulfate alteration?
  ---------- ---------- ---------- ---------- ---------- ---------- -------------- --------------- ---------- --------------------------

Table 1. Sample Identification numbers, Excel files containing
analytical data, site names, site localities, estimated dump size, and
site/sample descriptions (cont.)

  ---------- ---------- ---------- ---------- ---------- ------------ -------------- --------------- ----------- -------------------------
             **FILE**   **FILE**   **FILE**   **FILE**                                                           

             **SD**     **SD**     **SD**     **SD**     **Name or**  **Latitude**   **Longitude**   **Size**    

  **Sample   **GX97**   **TL97**   **PL97**   **PL99**   **BLM site   **N (deg)**    **W (deg)**     **Est.      **Site and/or sample
  ID**                                                   \#**                                        Tons**      description**

  NAS638                                      x          \--          37.8983        107.6792        na          Soil in red altered
                                                                                                                 volcanics, from acid
                                                                                                                 sulfate alteration?

  NAS699F                                     x          \--          37.8558        107.6775        na          Schwertmannite (?) ocher
                                                                                                                 crust in Cement Creek

  NAT088     x          x          x                     Highland     37.7886        107.5789        \>100,000   Highland Mary mill tails,
                                                         Mary tails                                              light tan, carbonate?

  NAT230     x          x          x                     Kitti-Mack   37.8606        107.5706        \>100,000   Kitti-Mack tails, pale
                                                         tails                                                   yellow

  NAT234     x          x          x                     Old          37.8622        107.5533        \<100       Old Kitti-Mack millsite,
                                                         Kitti-Mack                                              ocher tailings

  NAT258     x          x          x                     Highland     37.7886        107.5789        \>100,000   Highland Mary mill tails,
                                                         Mary tails                                              light tan, carbonate?

  NAT270     x          x          x                     Old Hundred  37.8244        107.5864        500?        Old Hundred mill tails,
                                                                                                                 ocher

  NAT287                                      x          \--          37.8061        107.5992        1,000       Tails from stamp mill L.
                                                                                                                 Giant

  NAT378     x          x          x                     Vermillion   37.9325        107.5961        \<100       Vermillion mill tails,
                                                         mill                                                    light gray

  NAT389     x          x          x                     South        37.8325        107.6003        \<100       South Howardsville mill
                                                         Howard.                                                 site, rusty tails at mill
                                                         Mill?                                                   

  NAT501                                      x          Brooklyn     37.8581        107.7111        1,000       Brooklyn tails, gray,
                                                                                                                 high pyrite

  NAT525                                      x          Ruby Trust   37.8447        107.7519        \<100       Ruby Trust tails in
                                                                                                                 foundation

  NAT600                                      x          \--          37.8511        107.7264        \<100       Tailings in burned
                                                                                                                 foundation, pale gray

  NAT602                                      x          Lodore       37.8022        107.6728        1,000       Ocher tailings near
                                                                                                                 Lodore mill

  NAT622                                      x          Lackawanna   37.8447        107.7533        30,000      Gray and ocher tailings,
                                                                                                                 Lackawanna

  NAT623                                      x          \--          37.8678        107.5664        fluvial     Ocher layer of tailings,
                                                                                                                 upper layer

  NAT624                                      x          \--          37.8678        107.5664        fluvial     Gray layer of mill
                                                                                                                 tailings, below ocher

  NAT628                                      x          \--          37.9208        107.5597        fluvial     Ocher tailings on sandbar

  NAT706                                      x          Bagley       37.9328        107.5789        10,000      Bagley tails, ocher, in
                                                                                                                 pond

  NAT720                                      x          \--          37.8044        107.5994        1,000       Below stamp mill, in
                                                                                                                 creek, coarse

  NAT742                                      x          Highland     37.7883        107.5800        100,000     Highland Mary tails,
                                                         Mary                                                    light, calcite?

  NAT830                                      x          Mastodon     37.9100        107.6003        na          Ocher tailings, reclaimed
                                                                                                                 1997
  ---------- ---------- ---------- ---------- ---------- ------------ -------------- --------------- ----------- -------------------------