Alliance Resource Partners, L.P. [ARLP]
Alpha Natural Resources, Inc. [ANR]
AMCOL International Corporation [ACO]
Applied Minerals, Inc. [AMNL]
Arch Coal, Inc. [ACI]
Atlatsa Resources Corporation [ATL]

BHP Billiton Limited [BHP]
BHP Billiton Plc [BBL]

Cameco Corporation [CCJ]
Can-Cal Resources, Ltd. [CCRE]
Cardero Resource Corp. [CDY]
China Natural Resources, Inc. [CHNR]
China Shen Zhou Mining & Resources, Inc. [SHZ]
Cliffs Natural Resources Inc. [CLF]
Cloud Peak Energy Inc. [CLD]
Compass Minerals International, Inc. [CMP]
CONSOL Energy Inc. [CNX]
Crosshair Exploration & Mining Corp. [CXZ]

Denison Mines Corp. [DNN]

General Moly, Inc. [GMO]
Globe Specialty Metals, Inc. [GSM]
Golden Minerals Company [AUMN]
Goldrich Mining Company [GRMC]
Great Northern Iron Ore Properties [GNI]

Hi-Crush Partners LP [HCLP]
Horsehead Holding Corp. [ZINC]
HudBay Minerals Inc. [HBM]

James River Coal Company [JRCC]

Kobex Minerals Inc. [KXM]

Liquidmetal Technologies, Inc. [LQMT]

Materion Corporation [MTRN]
McEwen Mining Inc. [MUX]
MFC Industrial Ltd [MIL]
Molycorp, Inc. [MCP]

Natural Resource Partners L.P. [NRP]
New Jersey Mining Company [NJMC]
North American Palladium Ltd. [PAL]
Northern Dynasty Minerals Ltd. [NAK]

Optex Systems Holdings, Inc. [OPXS]
Oxford Resource Partners, LP [OXF]

Pacific Booker Minerals Inc. [PBM]
Paramount Gold and Silver Corp. [PZG]
Peabody Energy Corporation [BTU]
Platinum Group Metals Ltd. [PLG]
PolyMet Mining Corp. [PLM]
Pretium Resources Inc. [PVG]
Puda Coal, Inc. [PUDA]

Quaterra Resources Inc. [QMM]

Rare Element Resources Ltd. [REE]
Revett Minerals, Inc. [RVM]
Rio Tinto plc [RIO]

Santa Fe Gold Corporation [SFEG]
Senetek PLC [SNKTY]
Sharpe Resources Corporation [SHGP]
Silver Bull Resources, Inc. [SVBL]
Sterlite Industries (India) Ltd [SLT]
Stillwater Mining Company [SWC]

Taseko Mines Limited [TGB]
Teck Resources Limited [TCK]
Thompson Creek Metals Company Inc. [TC]
Turquoise Hill Resources Ltd. [TRQ]

U.S. Silica Holdings, Inc. [SLCA]
United States Antimony Corporation [UAMY]
Ur-Energy Inc. [URG]
Uranerz Energy Corporation [URZ]
Uranium Energy Corp. [UEC]
Uranium Resources, Inc. [URRE]
USEC Inc. [USU]

Vale S.A. [VALE]

Walter Energy, Inc. [WLT]