EXHIBIT 10.1



|             |  |                            |  |                        
|------------ |  | -------------------------- |  | -----------------------
|Form 3400-12 |  |                            |  | FORM APPROVED          
|(April 2007) |  | UNITED STATES              |  | OMB NO.1004-0073       
|             |  | DEPARTMENT OF THE INTERIOR |  | Expires: March 31, 2010
|             |  | BUREAU OF LAND MANAGEMENT  |  |                        
|             |  |                            |  | Serial No.             
|             |  | COAL LEASE                 |  |                        
|             |  |                           
|             |  |                            |  | WYW155132              

PART 1: LEASE RIGHTS GRANTED

This lease, entered into by and between the UNITED STATES OF AMERICA, hereinafter called lessor, through the Bureaus of Land Management (BLM), and (Name and Address):

Foundation Wyoming Land Company

P.O. Box
3039

Gillette, Wyoming 82717-3039

hereinafter called lessee, is effective (date) 5 /01 /2008 , for a period of 20 years and for so long thereafter
as coal is produced in commercial quantities from the leased lands, subject to readjustment of lease terms at the end of the 20thlease year and
each 10-year period thereafter.

SEC. 1. This lease is issued pursuant and subject to the terms and provisions of the:



|x | Mineral Lands Leasing Act of 1920, Act of February 25, 1920, as amended, 41 Stat. 437, 30 U.S.C. 181-287, hereinafter referred to as the Act;
|- | ---------------------------------------------------------------------------------------------------------------------------------------------



| ̈ | Mineral Leasing Act for Acquired Lands, Act of August 7, 1947, 61 Stat. 913, 30 U.S.C. 351-359; and to the regulations and formal order of the Secretary of the Interior which
are now or hereafter in force, when not inconsistent with the express and specific provisions herein.
|- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

SEC. 2. Lessor, in consideration of
any bonuses, rents, and royalties to be paid, and the conditions and covenants to be observed as herein set forth, hereby grants and leases to lessee the exclusive right and privilege to drill for, mine, extract, remove, or otherwise process and
dispose of the coal deposits in, upon, or under the following described lands:

T.51
N., R. 72 W., 6thP.M., Wyoming

Sec.
19: Lots 13, 14, 19, and 20;

Sec. 20: Lots 10 (NW 1/4and S 1/2) and 11 through 15;

Sec. 29: Lots 1 (W 1/2), 2 through 7, 8 (W 1/2and SE 1/4), and 9 through 16;

Sec. 30: Lots 5, 6, 11 through 14, 19, and 20.

containing 1,427.77 acres, more or less, together with the right to
construct such works, buildings, plants, structures, equipment and appliances and the right to use such on-lease rights-of-way which may be necessary and convenient in the exercise of the rights and privileges granted, subject to the conditions
herein provided.

PART II. TERMS AND CONDITIONS

Sec. 1.
(a) RENTAL RATE Lessee must pay lessor rental annually and in advance for each acre or fraction thereof during the continuance of the lease at the rate of $3.00 for each lease year.

(b) RENTAL CREDITS  Rental will not be credited against either production or advance royalties for any year.

Sec. 2. (a) PRODUCTION ROYALTIES  The royalty will be 12.5 percent of the value of the coal as set forth in the regulations. Royalties are due to lessor the
final day of the month succeeding the calendar month in which the royalty obligation accrues.

(b) ADVANCE ROYALTIES  Upon request by the lessee, the
BLM may accept, for a total of not more than 10 years,* the payment of advance royalties in lieu of continued operation, consistent with the regulations. The advance royalty will be based on a percent of the value of a minimum
number of tons determined in the manner established by the advance royalty regulations in effect at the time the lessee requests approval to pay advance royalties in lieu of continued operation.

*20 years [Public Law 109-58]

SEC. 3. BONDS  Lessee must maintain in
the proper office a lease bond in the amount of $5,000.00. The BLM may require an increase in this amount when additional coverage is determined appropriate.

SEC. 4. DILIGENCE  This lease is subject to the conditions of diligent development and continued operation, except that these conditions are excused when operation under the lease are interrupted by strikes, the elements, or
casualties not attributable to the lessee. The lessor, in the public interest, may suspend the condition of continued operation upon payment of advance royalties in accordance with the regulations in existence at the time of the suspension.
Lessees failure to produce coal in commercial quantities at the end of 10 years will terminate the lease. Lessee must submit an operation and reclamation plan pursuant to Section 7 of the Act not later than 3 years after lease issuance.

The lessor reserves the power to assent to or order the suspension of the terms and conditions of this lease in accordance with, inter alia,
Section 39 of the Mineral Leasing Act, 30 U.S.C. 209.

SEC 5. LOGICAL MINING UNIT (LMU)  Either upon approval by the lessor of the lessees
application or at the direction of the lessor, this lease will become an LMU or part of an LMU, subject to the provisions set forth in the regulations.

The stipulations established in an LMU approval in effect at the time of LMU approval will supersede the relevant inconsistent terms of this lease so long as the lease remains committed to the LMU. If the LMU of which this lease is a part
is dissolved, the lease will then be subject to the lease terms which would have been applied if the lease had not been included in an LMU.

(Continued on
page 2)



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SEC 6. DOCUMENTS, EVIDENCE AND INSPECTION  At such times and in such form as lessor may prescribe,
lessee must furnish detailed statements showing the amounts and quality of all products removed and sold from the lease, the proceeds therefrom, and the amount used for production purposes or unavoidably lost.

Lessee must keep open at all reasonable times for the inspection by BLM the leased premises and all surface and underground improvements, works, machinery, ore
stockpiles, equipment, and all books, accounts, maps, and records relative to operations, surveys, or investigations on or under the leased lands.

Lessee
must allow lessor access to and copying of documents reasonably necessary to verify lessee compliance with terms and conditions of the lease.

While this
lease remains in effect, information obtained under this section will be closed to inspection by the public in accordance with the Freedom of Information Act (5 U.S.C. 552).

SEC. 7. DAMAGES TO PROPERTY AND CONDUCT OF OPERATIONS  Lessee must comply at its own expense with all reasonable orders of the Secretary, respecting diligent operations, prevention of waste, and protection of
other resources.

Lessee must not conduct exploration operations, other than casual use, without an approved exploration plan. All exploration plans prior
to the commencement of mining operations within an approved mining permit area must be submitted to the BLM.

Lessee must carry on all operations in
accordance with approved methods and practices as provided in the operating regulations, having due regard for the prevention of injury to life, health, or property, and prevention of waste, damage or degradation to any land, air, water, cultural,
biological, visual, and other resources, including mineral deposits and formations of mineral deposits not leased hereunder, and to other land uses or users. Lessee must take measures deemed necessary by lessor to accomplish the intent of this lease
term. Such measures may include, but are not limited to, modification to proposed siting or design of facilities, timing of operations, and specification of interim and final reclamation procedures. Lessor reserves to itself the right to lease,
sell, or otherwise dispose of the surface or other mineral deposits in the lands and the right to continue existing uses and to authorize future uses upon or in the leased lands, including issuing leases for mineral deposits not covered hereunder
and approving easements or rights-of-way. Lessor must condition such uses to prevent unnecessary or unreasonable interference with rights of lessee as may be consistent with concepts of multiple use and multiple mineral development.

SEC. 8. PROTECTION OF DIVERSE INTERESTS, AND EQUAL OPPORTUNITY  Lessee must: pay when due all taxes legally assessed and levied under the laws of the State or the
United States; accord all employees complete freedom of purchase; pay all wages at least twice each month in lawful money of the United States; maintain a safe working environment in accordance with standard industry practices; restrict the workday
to not more than 8 hours in any one day for underground workers, except in emergencies; and take measures necessary to protect the health and safety of the public. No person under the age of 16 years should be employed in any mine below the surface.
To the extent that laws of the State in which the lands are situated are more restrictive than the provisions in this paragraph, then the State laws apply.

Lessee will comply with all provisions of Executive Order No. 11246 of September 24, 1965, as amended, and the rules, regulations, and relevant orders of the Secretary of Labor. Neither lessee nor lessees subcontractors
should maintain segregated facilities.

SEC. 9. (a) TRANSFERS



|x | This lease may be transferred in whole or in part to any person, association or corporation qualified to hold such lease interest.
|- | ----------------------------------------------------------------------------------------------------------------------------------



| ̈ | This lease may be transferred in whole or in part to another public body or to a person who will mine coal on behalf of, and for the use of, the public body or to a person who for
the limited purpose of creating a security interest in favor of a lender agrees to be obligated to mine the coal on behalf of the public body.
|- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| ̈ | This lease may only be transferred in whole or in part to another small business qualified under 13 CFR 121.
|- | ------------------------------------------------------------------------------------------------------------

Transfers of record title, working or royalty interest must be approved in accordance with the regulations.

(b) RELINQUISHMENT  The lessee may relinquish in writing at any time all rights under this lease or any portion thereof as provided in the regulations. Upon
lessors acceptance of the relinquishment, lessee will be relieved of all future obligations under the lease or the relinquished portion thereof, whichever is applicable.

SEC. 10. DELIVERY OF PREMISES, REMOVAL OF MACHINERY, EQUIPMENT, ETC.  At such time as all portions of this lease are returned to lessor, lessee must deliver up to lessor the land leased, underground timbering,
and such other supports and structures necessary for the preservation of the mine workings on the leased premises or deposits and place all workings in condition for suspension or abandonment. Within 180 days thereof, lessee must remove from the
premises all other structures, machinery, equipment, tools, and materials that it elects to or as required by the BLM. Any such structures, machinery, equipment, tools, and materials remaining on the leased lands beyond 180 days, or approved
extension thereof, will become the property of the lessor, but lessee may either remove any or all such property or continue to be liable for the cost of removal and disposal in the amount actually incurred by the lessor. If the surface is owned by
third parties, lessor will waive the requirement for removal, provided the third parties do not object to such waiver. Lessee must, prior to the termination of bond liability or at any other time when required and in accordance with all applicable
laws and regulations, reclaim all lands the surface of which has been disturbed, dispose of all debris or solid waste, repair the offsite and onsite damage caused by lessees activity or activities incidental thereto, and reclaim access roads
or trails.

SEC. 11. PROCEEDINGS IN CASE OF DEFAULT  If lessee fails to comply with applicable laws, existing regulations, or the terms, conditions
and stipulations of this lease, and the noncompliance continues for 30 days after written notice thereof, this lease will be subject to cancellations by the lessor only by judicial proceedings. This provision will not be construed to prevent the
exercise by lessor of any other legal and equitable remedy, including waiver of the default. Any such remedy or waiver will not prevent later cancellation for the same default occurring at any other time.

SEC. 12. HEIRS AND SUCCESSORS-IN-INTEREST  Each obligation of this lease will extend to and be binding upon, and every benefit hereof will inure to, the heirs,
executors, administrators, successors, or assigns of the respective parties hereto.

SEC. 13. INDEMNIFICATION  Lessee must indemnify and hold
harmless the United States from any and all claims arising out of the lessees activities and operations under this lease.

SEC. 14. SPECIAL STATUTES
 This lease is subject to the Clean Water Act (33 U.S.C. 1252 et seq.), the Clean Air Act (42 U.S.C. 4274 et seq.), and to all other applicable laws pertaining to exploration activities, mining operations and reclamation, including the Surface
Mining Control and Reclamation Act of 1977 (30 U.S.C. 1201 et seq.).

SEC. 15. SPECIAL STIPULATIONS

See attached pages 5 through 9.



|                      |  |  |  |                       
|--------------------- |  |  |  | ----------------------
|(Continued on page 3) |  |  |  | (Form 3400-12, page 2)



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SEC. 15. SPECIAL STIPULATIONS (Contd.)

See attached pages 5 through 9.



|                            |  |  |  |                              |  |                       
|--------------------------- |  |  |  | ---------------------------- |  | ----------------------
|                            |  |  |  | THE UNITED STATES OF AMERICA
|                            |  |  | 
|Foundation Wyoming Land Co. |  |  |  | By                           |  | /s/ Donald A. Simpson 
|(Company or Lessee Name)    |  |  |  |                              |  |                       
|                            |  |  | 
|/s/ Steven Y. Rennell       |  |  |  |                              |  | Donald A. Simpson     
|(Signature of Lessee)       |  |  |  |                              |  | (BLM)                 
|                            |  |  | 
|Vice President              |  |  |  |                              |  | State Director, Acting
|(Title)                     |  |  |  |                              |  | (Title)               
|                            |  |  | 
|3-13-08                     |  |  |  |                              |  | April 8, 2008         
|(Date)                      |  |  |  |                              |  | (Date)                

Title 18 U.S.C. Section 1001, makes it a crime for any person knowingly and willfully to make to any
department or agency of the United States any false, fictitious or fraudulent statements or representations as to any matter within its jurisdiction.

NOTICES

The Privacy Act of 1974 and the regulation in 43 CFR 2.48(d) provide that you be furnished with the following
information in connection with information required by this application.

AUTHORITY: 30 U.S.C. 181-287 and 30 U.S.C. 351-359.

PRINCIPAL PURPOSE: BLM will use the information you provide to process your application and determine if you are eligible to hold a lease on BLM Land.

ROUTINE USES: BLM will only disclose the information according to the regulations at 43 CFR 2.56(d).

EFFECT OF NOT PROVIDING INFORMATION: Disclosing the information is necessary to receive a benefit. Not disclosing the information may result in BLMs rejecting your request for a lease.

The Paperwork Reduction Act of 1995 requires us to inform you that:

The BLM
collects this information to authorize and evaluate proposed exploration and mining operations on public lands.

Response to the provisions of this lease
form is mandatory for the types of activities specified.

The BLM would like you to know that you do not have to respond to this or any other Federal
agency-sponsored information collection unless it displays a currently valid OMB control number.

BURDEN HOURS STATEMENT: Public reporting burden for this
form is estimated to average one hour per response including the time for reading the instructions and provisions, and completing and reviewing the form. Direct comments regarding the burden estimate or any other aspect of this form to U.S.
Department of the Interior, Bureau of Land Management (1004-0073), Bureau Information Collection Clearance Officer (WO-630), 1849 C Street, Mail Stop 401 LS, Washington, D.C. 20240.

(Form 3400-12, page 3)



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DEFERRED BONUS PAYMENT SCHEDULE

TO BE ATTACHED TO AND MADE A PART OF

FEDERAL COAL LEASE WYW155132

This lease is issued subject to the payment of $144,432,000.00 by the lessee as a deferred bonus. Payment of the deferred bonus by the lessee shall be made as
follows:

Total amount of bid: $180,540,000.00.

One-fifth in the amount of $36,108,000.00 submitted on the date of sale.

Balance is due and payable in equal annual installments on the
first four anniversary dates of the lease:

One-fifth in the amount of $36,108,000.00 due on __May 1, 2009
.

One-fifth in the amount of $36,108,000.00
due on __May 1, 2010 .

One-fifth in the amount of
$36,108,000.00 due on __May 1, 2011 .

One-fifth in the amount of $36,108,000.00 due on __May 1, 2012 .



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SEC. 15. SPECIAL STIPULATIONS 

In addition to observing the general obligations and standards of performance set out in the current regulations, the lessee shall comply with and be bound by the
following special stipulations.

These stipulations are also imposed upon the lessees agent and employees. The failure or refusal of any of these
persons to comply with these stipulations shall be deemed a failure of the lessee to comply with the terms of the lease. The lessee shall require his agents, contractors and subcontractors involved in activities concerning this lease to include
these stipulations in the contracts between and among them. These stipulations may be revised or amended, in writing, by the mutual consent of the lessor and the lessee at any time to adjust to changed conditions or to correct an oversight.

(a) CULTURAL RESOURCES  (1) Before undertaking any activities that may disturb the surface of the leased lands, the lessee shall
conduct a cultural resource intensive field inventory in a manner specified by the Authorized Officer of the BLM or of the surface managing agency, if different, on portions of the mine plan area and adjacent areas, or exploration plan area, that
may be adversely affected by lease-related activities and which were not previously inventoried at such a level of intensity. The inventory shall be conducted by a qualified professional cultural resource specialist (i.e., archeologist, historian,
historical architect, as appropriate), approved by the Authorized Officer of the surface managing agency (BLM, if the surface is privately owned), and a report of the inventory and recommendations for protecting any cultural resources identified
shall be submitted to the Regional Director of the Western Region of the Office of Surface Mining (the Western Regional Director), the Authorized Officer of the BLM, if activities are associated with coal exploration outside an approved mining
permit area (hereinafter called Authorized Officer), and the Authorized Officer of the surface managing agency, if different. The lessee shall undertake measures, in accordance with instructions from the Western Regional Director, or Authorized
Officer, to protect cultural resources on the leased lands. The lessee shall not commence the surface disturbing activities until permission to proceed is given by the Western Regional Director or Authorized Officer.

(2) The lessee shall protect all cultural resource properties that have been determined eligible to the National Register of Historic Places within the lease area from
lease-related activities until the cultural resource mitigation measures can be implemented as part of an approved mining and reclamation or exploration plan unless modified by mutual agreement in consultation with the State Historic Preservation
Officer.

(3) The cost of conducting the inventory, preparing reports, and carrying out mitigation measures shall be borne by the lessee.



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SEC. 15. SPECIAL STIPULATIONS (Continued) 

(4) If cultural resources are discovered during operations under this lease, the lessee shall immediately bring them to the attention of the Western Regional Director or
Authorized Officer, or the Authorized Officer of the surface managing agency, if the Western Regional Director is not available. The lessee shall not disturb such resources except as may be subsequently authorized by the Western Regional Director or
Authorized Officer.

Within two (2) working days of notification, the Western Regional Director or Authorized Officer will evaluate or have evaluated
any cultural resources discovered and will determine if any action may be required to protect or preserve such discoveries. The cost of data recovery for cultural resources discovered during lease operations shall be borne by the lessee unless
otherwise specified by the Authorized Officer of the BLM or of the surface managing agency, if different.

(5) All cultural resources shall remain under
the jurisdiction of the United States until ownership is determined under applicable law.

(b) PALEONTOLOGICAL RESOURCES  If
paleontological resources, either large and conspicuous, and/or of significant scientific value are discovered during mining operations, the find will be reported to the Authorized Officer immediately. Mining operations will be suspended within 250
feet of said find. An evaluation of the paleontological discovery will be made by a BLM-approved professional paleontologist within five (5) working days, weather permitting, to determine the appropriate action(s) to prevent the potential loss
of any significant paleontological value. Operations within 250 feet of such discovery will not be resumed until written authorization to proceed is issued by the Authorized Officer. The lessee will bear the cost of any required paleontological
appraisals, surface collection of fossils, or salvage of any large conspicuous fossils of significant scientific interest discovered during the operations.

(c) THREATENED, ENDANGERED, CANDIDATE, or OTHER SPECIAL STATUS PLANT and ANIMAL SPECIES  The lease area may now or hereafter contain plants, animals, or their habitats determined to be threatened or endangered under the
Endangered Species Act of 1973, as amended, 16 U.S.C. 1531 et seq., or that have other special status. The Authorized Officer may recommend modifications to exploration and development proposals to further conservation and management
objectives or to avoid activity that will contribute to a need to list such species or their habitat or to comply with any biological opinion issued by the Fish and Wildlife Service for the Proposed Action. The Authorized Officer will not approve
any ground-disturbing activity that may affect any such species or critical habitat until it completes its obligations under applicable requirements of the Endangered Species Act. The Authorized Officer may require modifications to, or disapprove a
proposed activity that is likely to result in jeopardy to the continued existence of a proposed or listed threatened or endangered species, or result in the destruction of adverse modification of designated or proposed critical habitat.



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SEC. 15. SPECIAL STIPULATIONS (Continued) 

The lessee shall comply with instructions from the Authorized Officer of the surface managing agency (BLM, if the surface is private) for ground disturbing activities
associated with coal exploration on federal coal leases prior to approval of a mining and reclamation permit or outside an approved mining and reclamation permit area. The lessee shall comply with instructions from the Authorized Officer of the
Office of Surface Mining Reclamation and Enforcement, or his designated representative, for all ground disturbing activities taking place within an approved mining and reclamation permit area or associated with such a permit.

(d) MULTIPLE MINERAL DEVELOPMENT  Operations will not be approved which, in the opinion of the Authorized Officer, would unreasonably interfere with
the orderly development and/or production from a valid existing mineral lease issued prior to this one for the same lands.

(e) OIL AND GAS/COAL
RESOURCES  The BLM realizes that coal mining operations conducted on Federal coal leases issued within producing oil and gas fields may interfere with the economic recovery of oil and gas; just as Federal oil and gas leases issued in a
Federal coal lease area may inhibit coal recovery. BLM retains the authority to alter and/or modify the resource recovery and protection plans for coal operations and/or oil and gas operations on those lands covered by Federal mineral leases so as
to obtain maximum resource recovery.

(f) RESOURCE RECOVERY AND PROTECTION  Notwithstanding the approval of a resource recovery and
protection plan (R2P2) by the BLM, lessor reserves the right to seek damages against the operator/lessee in the event (i) the operator/lessee fails to achieve maximum economic recovery (MER) (as defined at 43 CFR 3480.0-5(21)) of the
recoverable coal reserves or (ii) the operator/lessee is determined to have caused a wasting of recoverable coal reserves. Damages shall be measured on the basis of the royalty that would have been payable on the wasted or unrecovered coal.

The parties recognize that under an approved R2P2, conditions may require a modification by the operator/lessee of that plan. In the event a coal bed or
portion thereof is not to be mined or is rendered unmineable by the operation, the operator/lessee shall submit appropriate justification to obtain approval by the Authorized Officer to leave such reserves unmined. Upon approval by the Authorized
Officer, such coal beds or portions thereof shall not be subject to damages as described above. Further, nothing in this section shall prevent the operator/lessee from exercising its right to relinquish all or portion of the lease as authorized by
statute and regulation.



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SEC. 15. SPECIAL STIPULATIONS (Continued) 

In the event the Authorized Officer determines that the R2P2, as approved, will not attain MER as the result of changed conditions, the Authorized Officer will give
proper notice to the operator/lessee as required under applicable regulations. The Authorized Officer will order a modification if necessary, identifying additional reserves to be mined in order to attain MER. Upon a final administrative or judicial
ruling upholding such an ordered modification, any reserves left unmined (wasted) under that plan will be subject to damages as described in the first paragraph under this section.

Subject to the right to appeal hereinafter set forth, payment of the value of the royalty on such unmined recoverable coal reserves shall become due and payable upon determination by the Authorized Officer that the
coal reserves have been rendered unmineable or at such time that the operator/lessee has demonstrated an unwillingness to extract the coal.

The BLM may
enforce this provision either by issuing a written decision requiring payment of the Mineral Management Service demand for such royalties, or by issuing a notice of non-compliance. A decision or notice of non-compliance issued by the lessor that
payment is due under this stipulation is appealable as allowed by law.

(g) PUBLIC LAND SURVEY PROTECTION  The lessee will protect all
survey monuments, witness corners, reference monuments, and bearing trees against destruction, obliteration, or damage during operations on the lease areas. If any monuments, corners or accessories are destroyed, obliterated, or damaged by this
operation, the lessee will hire an appropriate county surveyor or registered land surveyor to reestablish or restore the monuments, corners, or accessories at the same location, using surveying procedures in accordance with the Manual of
Surveying Instructions for the Survey of the Public Lands of the United States. The survey will be recorded in the appropriate county records, with a copy sent to the Authorized Officer.

(h) BUFFER ZONES FOR RIGHTS-OF-WAY OF PUBLIC ROADS, SCHOOL BUILDING, AND OCCUPIED DWELLINGS  (1) No mining activity of any kind may be conducted
within the U.S. Highway 14-16 right-of-way and associated 100-feet buffer zone while the highway remains in its current (2007) location. The Wyoming Department of Transportation has accepted a proposal from Foundation Coal West, Inc. to
relocate U.S. Highway 14-16. Accordingly, the lessee shall recover all legally and economically recoverable coal from all leased lands within the current U.S. Highway 14-16 right-of-way and associated buffer zone after the highway is moved. The
lessee shall pay all royalties on any legally and economically recoverable coal which it fails to mine without the written permission of the Authorized Officer.



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SEC. 15. SPECIAL STIPULATIONS (Continued) 

(2) No mining of any kind may be conducted within 300 feet of the Rawhide public school building, 100 feet of the right-of-way of the public road to the school, and 300
feet of any occupied dwellings. The lessee shall recover all legally and economically recoverable coal from all leased lands not within these buffer zones. Provided written permission is given to mine within these buffer zones by the schools
authorized officer and owners of the occupied dwellings, the lessee shall recover all legally and economically recoverable coal from all leased lands within the foregoing buffer zones. The lessee shall pay all royalties on any legally and
economically recoverable coal which it fails to mine without the written permission of the Authorized Officer.