---

Exhibit 99.18

Mine Safety Disclosure

The following
  disclosures are provided pursuant to the Dodd-Frank Wall Street Reform and Consumer
  Protection Act (the Act) and item 104 of Regulation S-K, which requires
  certain disclosures by companies required to file periodic reports under the
  Securities Exchange Act of 1934, as amended, that operate mines regulated under
  the Federal Mine Safety and Health Act of 1977 (the Mine Act).

Mine
Safety Information.Whenever the Federal Mine Safety and Health
Administration (MSHA) believes a violation of the Mine Act, any health or
safety standard or any regulation has occurred, it may issue a citation which
describes the alleged violation and fixes a time within which the U.S. mining
operator (e.g. our subsidiary, Jerritt Canyon Mine) must abate the alleged
violation. In some situations, such as when MSHA believes that conditions pose a
hazard to miners, MSHA may issue an order removing miners from the area of the
mine affected by the condition until the alleged hazards are corrected. When
MSHA issues a citation or order, it generally proposes a civil penalty, or fine,
as a result of the alleged violation, that the operator is ordered to pay.
Citations and orders can be contested and appealed, and as part of the process,
are often reduced in severity and amount, and are sometimes dismissed. The
number of citations, orders and proposed assessments vary depending on the size
and type (underground or surface) of the mine as well as by the MSHA
inspector(s) assigned.

The
below tables reflects citations and orders issued to us by MSHA during the year
ended December 31, 2012. The proposed assessments for the year ended December
31, 2012 were taken from the MSHA data retrieval system as of March 27, 2012.

Additional Information about the Act and MSHA references
used in the table follows:

- Section 103(j) Citations: In the event of any accident
  occurring in any coal or other mine, the operator shall notify the
  Secretary thereof and shall take appropriate measures to prevent the
  destruction of any evidence which would assist in investigating the
  cause or causes thereof. In the event of any accident occurring in a coal or
  other mine, where rescue and recovery work is necessary, the Secretary
  or an authorized representative of the Secretary shall take whatever
  action he deems appropriate to protect the life of any person, and he may, if
  he deems it appropriate, supervise and direct the rescue and recovery
  activities in such mine.
- Section 104 Citations: Citations received from MSHA under
  section 104 of the Mine Act for violations of mandatory health or
  safety standards that could significantly and substantially contribute to the
  cause and effect of a mine safety or health hazard.
- Section 104(a) Citations: If, upon inspection or investigation, the
  Secretary or his authorized representative believes that an operator of
  a coal or other mine subject to this Act has violated this Act, or any
  mandatory health or safety standard, rule, order, or regulation
  promulgated pursuant to this Act, he shall, with reasonable promptness,
  issue a citation to the operator. Each citation shall be in writing and shall
  describe with particularity the nature of the violation, including a
  reference to the provision of the Act, standard, rule, regulation, or
  order alleged to have been violated. In addition, the citation shall
  fix a reasonable time for the abatement of the violation. The
  requirement for the issuance of a citation with reasonable promptness shall
  not be a jurisdictional prerequisite to the enforcement of any
  provision of this Act.
- Section 104(b) Orders: Orders issued by MSHA under
  section 104(b) of the Mine Act, If, upon any follow-up inspection of a
  coal or other mine, an authorized representative of the Secretary finds (1)
  that a violation described in a citation issued pursuant to subsection
  (a) has not been totally abated within the period of time as originally
  fixed therein or as subsequently extended, and (2) that the period of time for
  the abatement should not be further extended, he shall determine the
  extent of the area affected by the violation and shall promptly issue an
  order requiring the operator of such mine or his agent to immediately cause
  all persons, except those persons referred to in subsection (c), to be
  withdrawn from, and to be prohibited from entering, such area until an
  authorized representative of the Secretary determines that such violation
  has been abated.
- Section 104(d)(1) Citations and Orders: Citations and
  orders issued by MSHA under section 104(d) of the Mine Act for If, upon
  any inspection of a coal or other mine, an authorized representative of the
  Secretary finds that there has been a violation of any mandatory health
  or safety standard, and if he also finds that, while the conditions
  created by such violation do not cause imminent danger, such violation is of
  such nature as could significantly and substantially contribute to the
  cause and effect of a coal or other mine safety or health hazard, and
  if he finds such violation to be caused by an unwarrantable failure of such
  operator to comply with such mandatory health or safety standards, he
  shall include such finding in any citation given to the operator under
  this Act. If, during the same inspection or any subsequent inspection
  of such mine within 90 days after the issuance of

---

- Section 104(d)(2) Violations: Flagrant violations issued by
  MSHA under section 110(b)(2) of the Mine Act. If a withdrawal order with
  respect to any area in a coal or other mine has been issued pursuant to
  paragraph (1), withdrawal order shall promptly be issued by an authorized
  representative of the Secretary who finds upon any subsequent inspection the
  existence in such mine of violations similar to those that resulted in the
  issuance of the withdrawal order under paragraph (1) until such time as an
  inspection of such mine discloses no similar violations. Following an
  inspection of such mine which discloses no similar violations, the provisions
  of paragraph (1) shall again be applicable to the mine.
- Section 104(g)(1) Orders: If, upon any inspection or
  investigation pursuant to section 103 of this Act, the Secretary or an
  authorized representative shall find employed at a coal or other mine a miner
  who has not received the requisite safety training as determined under
  section 115 of this Act, the Secretary or an authorized representative
  shall issue an order under this section which declares such miner to be a
  hazard to himself and to others, and requiring that such miner be
  immediately withdrawn from the coal or other mine, and be prohibited
  from entering such mine until an authorized representative of the Secretary
  determines that such miner has received the training required by
  section 115 of this Act.
- Section 107(a) Orders: If, upon any inspection or
  investigation of a coal or other mine which is subject to this Act, an
  authorized representative of the Secretary finds that an imminent danger
  exists, such representative shall determine the extent of the area of
  such mine throughout which the danger exists, and issue an order requiring
  the operator of such mine to cause all persons, except those referred to in
  section 104(c), to be withdrawn from, and to be prohibited from
  entering, such area until an authorized representative of the Secretary
  determines that such imminent danger and the conditions or practices
  which caused such imminent danger no longer exist. The issuance of an
  order under this subsection shall not preclude the issuance of a citation
  under section 104 or the. Proposing of a penalty under section 110.

|                    |         |         |              |         | Section   |           |         |               
|------------------- | ------- | ------- | ------------ | ------- | --------- | --------- | ------- | --------------
|                    | Section | Section | Section      | Section | 104(d)    | Section   | Section | Proposed      
|                    | 103(j)  | 103(k)  | 104(a)       | 104(b)  | Orders&   | 104(g)(1) | 107(a)  | Penalties     
|Mine(1)(2)          | Orders  | Orders  | Citations(3) | Orders  | Citations | Orders    | Orders  | ($)(4)        
|Jerritt Canyon Mine | 0       | 0       | 156          | 1       | 4         | 2         | 1       | $281,471      
|SSX Mine            | 0       | 0       | 63           | 0       | 3         | 0         | 0       | $
      49,723

|(1) | The table above reflects citations and orders issued to
      us by MSHA during the year ended December 31, 2012.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(2) | The definition of mine under section 3 of the Mine Act
      includes the mine, as well as other items used in, or to be used in, or
      resulting from, the work of extracting minerals, such as land, structures,
      facilities equipment, machines, tools and minerals preparation facilities.
      Unless otherwise indicated, any of these other items associated with a
      single mine have been aggregated in the totals for that mine. MSHA assigns
      an identification number to each mine and may or may not assign separate
      identification numbers to related facilities such as preparation
      facilities. We are providing the information in the table by mine rather
      than MSHA identification number because that is how we manage and operate
      our mining business and we believe this presentation will be more useful
      to investors than providing information based on MSHA identification
      numbers.
|(3) | 173 Section 104 Citations were subject to contest as of
      December 31, 2012.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|(4) | Represents the total dollar value of the proposed
      assessment from MSHA under the Mine Act pursuant to the citations and or
      orders preceding such dollar value in the corresponding
  row.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

Pattern or Potential Pattern of Violation:During the year ended
December 31, 2012, one of the mines operated by us received written notice from
MSHA of (a) potential pattern of violations of mandatory health or safety
standards that are of such nature as could have significantly and substantially
contributed to the cause and effect of mine health or safety hazards under
section 104(e) of the Mine Act or (b) the potential to have such a
pattern. Pending Legal Actions:The following table reflects pending legal
actions before the Federal Mine Safety and Health Review Commission (the
Commission), an independent adjudicative agency that provides administrative
trial and appellate review of legal disputes arising under the Mine Act, as of
December 31, 2012, together with the number of legal actions instituted and the
number of legal actions resolved during 2012.

---

|                    | Pending Legal | Legal Actions  | Legal Actions
|------------------- | ------------- | -------------- | -------------
|                    | Actions as of | Instituted     | Resolved     
|Mine(1)             | 12/31/2012(2) | During 2012(2) | During 2012  
|Jerritt Canyon Mine | 173           | 173            | 140          
|SSX Mine            | 67            | 67             | 45           
|Total:              | 240           | 240            | 185          

|(1) | The definition of mine under section 3 of the Mine Act
      includes the mine, as well as other items used in, or to be used in, or
      resulting from, the work of extracting minerals, such as land, structures,
      facilities, equipment, machines, tools and minerals preparation
      facilities. Unless otherwise indicated, any of these other items
      associated with a single mine have been aggregated in the totals for that
      mine. MSHA assigns an identification number to each mine and may or may
      not assign separate identification numbers to related facilities such as
      preparation facilities. We are providing the information in the table by
      mine rather than MSHA identification number because that is how we manage
      and operate our mining business and we believe this presentation will be
      more useful to investors than providing information based on MSHA
      identification numbers.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|(2) | The foregoing list includes legal actions which were
      initiated prior to the current reporting period and which do not
      necessarily relate to citations, orders or proposed assessments issued by
      MSHA during the year ended December 31, 2012.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

Legal Actions pending before the Commission may involve, among
other questions, challenges by operators to citations, orders and penalties they
have received from MSHA or complaints of discrimination by miners under section
105 of the Mine Act.

The following is a brief description of the types of legal
actions that may be brought before the Commission:

- Contests of Citations and Orders:A contest
  proceeding may be filed with the Commission by operators, miners or miners
  representatives to challenge the issuance of a citation or order issued by
  MSHA.
- Contests of Proposed Penalties (Petitions for Assessment of
  Penalties):A contest of a proposed penalty is an administrative
  proceeding before the Commission challenging a civil penalty that MSHA has
  proposed for the alleged violation contained in a citation or order. The
  validity of the citation may also be challenged in the proceeding as well.
- Complaints for Compensation:A complaint for compensation
  may be filed with the Commission by miners entitled to compensation when a
  mine is closed by certain withdrawal orders issued by MSHA. The purpose of the
  proceeding is to determine the amount of compensation, if any, due to miners
  idled by the orders.
- Complaints of Discharge, Discrimination or Interference:A
  discrimination proceeding is a case that involves a miners allegation that he
  or she has suffered a wrong by the operator because he or she engaged in some
  type of activity protected under the Mine Act, such as making a safety
  complaint.
- Applications for Temporary Relief:An application for
  temporary relief from any modification or termination of any order or from any
  order issued under section 104 of the Mine Act.
- Appeals of Judges Decisions or Orders to the Commission:A
  filing with the Commission of a petition for discretionary review of a Judges
  decision or order by a person who has been adversely affected or aggrieved by
  such decision or order.

|The
      following table reflects the types of legal actions pending before the Commission
      as ofDecember 31, 2012.
|-------------------------------------------------------------------------------------------------------------------------
|                                                                                                                         
|                                                                                                                         
|                                                                                                                         
|                                                                                                                         
|Mine(1)                                                                                                                  
|Jerritt Canyon Mine                                                                                                      
|SSX Mine                                                                                                                 
|Total:                                                                                                                   

|(1) | The definition of mine under section 3 of the Mine Act
      includes the mine, as well as other items used in, or to be used in, or
      resulting from, the work of extracting minerals, such as land, structures,
      facilities, equipment, machines, tools and minerals preparation
      facilities. Unless otherwise indicated, any of these other items
      associated with a single mine have been aggregated in the totals for that
      mine. MSHA assigns an identification number to each mine and may or may
      not
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

---

assign separate identification numbers
to related facilities such as preparation facilities. We are providing the
information in the table by mine rather than MSHA identification number because
that is how we manage and operate our mining business and we believe this
presentation will be more useful to investors than providing information based
on MSHA identification numbers.

---