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Black Metal Reduction Co Mill Colorado Boulder Tungsten 1151 x 861, Gray
Blue Jay fluorspar mining Colorado Boulder Fluorspar 1318 x 795, Gray
City of Caribou Colorado Boulder Gold/Silver 1281 x 816, Gray
Clyde Mine Colorado Boulder 1189 x 951, Gray
Cold Spring Mine Colorado Boulder Tungsten 1360 x 811, Gray
Denver-Boulder Co Tungsten Co Colorado Boulder 1298 x 803, Gray
Emmett Fluorspar Mine Colorado Boulder 1392 x 816, Gray
Feberite Tungsten Mill Colorado Boulder Tungsten 1215 x 919, Gray
Gale Mine Colorado Boulder Tungsten 1218 x 951, Gray
Idealite Plant & Clay Mine Colorado Boulder Clay 994 x 1064, Gray
John Duncan Mill Colorado Boulder 1203 x 957, Gray
Katie Ferberite Mine Colorado Boulder Tungsten 1249 x 960, Gray
Luckie 2 Tungsten Mill Colorado Boulder Tungsten 1256 x 859, Gray
Mojave Boulder Tungsten Mining Co Colorado Boulder Tungsten 693 x 1464, Gray
Mojave Boulder Tungsten Mining Co Colorado Boulder Tungsten 761 x 1361, Gray
Primos Exploration Co Mill Colorado Boulder 968 x 728, Gray
Primos Exploration Co open cut Colorado Boulder 1180 x 944, Gray
Primos Exploration Co open cut Colorado Boulder 1243 x 901, Gray
Primos Exploration Co open cut Colorado Boulder 1201 x 910, Gray
Primos Mining Co Colorado Boulder 1172 x 944, Gray
Primos Mining Co Colorado Boulder 1338 x 884, Gray
Primos Mining and Milling Co Colorado Boulder 1181 x 943, Gray
Quaker Mine Colorado Boulder 1175 x 969, Gray
Tungsten Vein Mine Colorado Boulder Tungsten 1483 x 866, Gray
Tungsten Vein Mine Colorado Boulder Tungsten 1209 x 900, Gray
Wolf Tongue Mining Co Colorado Boulder Tungsten 1302 x 767, Gray
Wolf Tongue Mining Co Colorado Boulder 1241 x 835, Gray
Wolf Tongue Mining Co Colorado Boulder 1219 x 943, Gray
Wolf Tongue Mining Co Colorado Boulder 1199 x 860, Gray
Wolf Tongue Mining Co Colorado Boulder Silver 1431 x 807, Gray
Colorado-American Fluorspar Mine Colorado Chaffee 1021 x 1096, Gray
Turquoise Mining Company mines Colorado Conejos Turquoise 1328 x 912, Gray
Geyser Mine Colorado Custer 1306 x 994, Gray
Geyser Mine Colorado Custer 1466 x 967, Gray
Maverick (Senator) Mine Colorado Custer 1260 x 1004, Gray
Pocahontas Hill Colorado Custer 1166 x 775, Gray
Rollins Coal Mine Colorado Delta Coal 1260 x 908, Gray
Black Hawk Mine Colorado Dolores 781 x 1238, Gray
Delores Mountain Colorado Dolores 1202 x 856, Gray
Marguerite Gulch Mine Colorado Dolores 1184 x 998, Gray
Newman Hill mines Colorado Dolores 1251 x 907, Gray
Puzzle Mine Colorado Dolores 1231 x 847, Gray
Rico-Aspen Mine Colorado Dolores 781 x 1238, Gray
Gilman Zinc Mine Colorado Eagle Zinc 1536 x 1024, sRGB
Gilman Zinc Mine Colorado Eagle Zinc 1536 x 1024, sRGB
Lady Belle Mine Colorado Eagle 792 x 1193, Gray
Roaring Fork Plaster Company Colorado Eagle Gypsum 826 x 1407, Gray
Roaring Fork Plaster Company Colorado Eagle 1275 x 884, Gray
Carlton Mine Colorado El Paso 1368 x 735, Gray
Danville Mine Colorado El Paso Gold 1238 x 769, Gray
Colorado Portland Cement quarry Colorado Fremont Gypsum 1301 x 759, Gray
Colorado Portland Cement quarry Colorado Fremont Gypsum 1390 x 826, Gray
Mica Hill Mica Mine Colorado Fremont Mica 1216 x 1049, Gray
P.C. Company of Colorado Mine Colorado Fremont Cement 1218 x 944, Gray
Portland Cement & Wall Plaster Plt Colorado Fremont Cement 1209 x 905, Gray
American Shale Refining Co retort Colorado Garfield Oil Shale 829 x 1407, Gray
Colony Mine Colorado Garfield Oil Shale 1335 x 874, sRGB
Colony plant site Colorado Garfield Oil Shale 1370 x 929, Gray
Coryell Coal Mine Colorado Garfield 1262 x 833, Gray
Coryell Coal Mine Colorado Garfield Coal 1306 x 922, Gray
Dutton and Halsey Mine Colorado Garfield Coal 1050 x 1090, Gray
Experimental cement plant Colorado Garfield Cement 1251 x 902, Gray
Geokinetics Oil Shale site Colorado Garfield Oil Shale 1303 x 905, Gray
Geokinetics test site Colorado Garfield Oil Shale 1310 x 938, sRGB
Gilson Asphaltum Company Mine Colorado Garfield Coal 1254 x 857, Gray
Logan Wash mine Colorado Garfield Oil Shale 1415 x 949, sRGB
Mt. Logan Shale plant Colorado Garfield Oil Shale 772 x 1552, Gray
Oil Shale retort Colorado Garfield 1273 x 748, Gray
Oil Shale tract C-b Colorado Garfield Oil Shale 1305 x 904, Gray
Oil Shale tract C-b Colorado Garfield Oil Shale 1339 x 920, Gray
Oil Shale tract C-b Colorado Garfield Oil Shale 1394 x 906, Gray
Rifle Mine Colorado Garfield 1177 x 998, Gray
Rifle Mine Colorado Garfield Vanadium 1536 x 1024, sRGB
Rifle Mine Colorado Garfield Vanadium 1536 x 1024, sRGB
South Canyon mines Colorado Garfield 1247 x 897, Gray
Town of Battlement Mesa Colorado Garfield Oil Shale 1001 x 1295, sRGB
Town of Battlement Mesa Colorado Garfield Oil Shale 1333 x 915, Gray
Union's oil shale site Colorado Garfield Oil Shale 1324 x 890, sRGB
Union's oil shale site Colorado Garfield Oil Shale 996 x 1300, sRGB
Union's oil shale site Colorado Garfield Oil Shale 1299 x 884, Gray
Acid Run Off Colorado Gilpin Gold/Silver 1536 x 1024, sRGB
Acid Run Off Colorado Gilpin Gold/Silver 1536 x 1024, sRGB
Acid Run Off Colorado Gilpin Gold/Silver 1536 x 1024, sRGB
Alice Mine and Mill Colorado Gilpin Gold/Silver 1021 x 1082, Gray
Chase Mine Colorado Gilpin Gold/Silver 1180 x 868, Gray
City of Blackhawk Colorado Gilpin 1221 x 840, Gray
Mine Tailings Colorado Gilpin Gold/Silver 1536 x 1024, sRGB
Rare Metal Ores Mill Colorado Gilpin 1203 x 830, Gray
Russell Gulch mines Colorado Gilpin Gold/Silver 1144 x 1014, Gray
Aberdeen granite quarry Colorado Gunnison Granite 1198 x 873, Gray
Colorado Yule Marble Co quarry Colorado Gunnison Marble 1220 x 938, Gray
Colorado Yule Marble Co quarry Colorado Gunnison Marble 1263 x 959, Gray
Colorado Yule Marble Co quarry Colorado Gunnison Marble 1441 x 844, Gray
Colorado Yule Marble Co quarry Colorado Gunnison Marble 1433 x 869, Gray
Crested Butte coal mine Colorado Gunnison Coal 1181 x 979, Gray
Crested Butte coal mine Colorado Gunnison Coal 1165 x 913, Gray
Good Hope Mine Colorado Gunnison 1101 x 865, Gray
Porter Mine Colorado Gunnison Coal 1216 x 911, Gray
Ruby-Anthracite Coal Mine Colorado Gunnison Coal 1177 x 1005, Gray
Ruby-Anthracite Coal Mine Colorado Gunnison Coal 1240 x 926, Gray
Good Hope Mine Colorado Hinsdale 1536 x 1024, sRGB
Good Hope Mine Colorado Hinsdale 1536 x 1024, sRGB
Good Hope Mine Colorado Hinsdale 1536 x 1024, sRGB
Good Hope Mine Colorado Hinsdale 1536 x 1024, sRGB
Regent Mine Colorado Hinsdale Silver 1296 x 907, Gray
Camp Colorado Jackson 822 x 1251, Gray
Camp Creek Mine Colorado Jackson 1038 x 972, Gray
Coal pit Colorado Jackson Coal 1166 x 828, Gray
Coal structure Colorado Jackson Coal 1131 x 822, Gray
Coalmont Mine Colorado Jackson Coal 1268 x 834, Gray
Coalmont Mine Colorado Jackson Coal 1412 x 762, Gray
Coalmont Mine Colorado Jackson Coal 1381 x 739, Gray
Coalmont Mine Colorado Jackson Coal 1151 x 886, Gray
Coalmont Mine Colorado Jackson Coal 1015 x 1029, Gray
Colorado Fluorspar Corp Mine Colorado Jackson Fluorspar 1345 x 749, Gray
Fluorine open pit Colorado Jackson 1038 x 938, Gray
Fluorine open pit Colorado Jackson 794 x 1324, Gray
Fluorspar Mill Colorado Jackson 736 x 1371, Gray
Western Mill Colorado Jackson 928 x 1077, Gray
Gold King Mill Colorado La Plata Gold 1319 x 929, Gray
Perrine Peak Coal Mine Colorado La Plata Coal 1163 x 887, Gray
Porter Mine Colorado La Plata 1160 x 844, Gray
Porter Mine Colorado La Plata 908 x 1164, Gray
A.G. & Minne Mines Colorado Lake 1282 x 952, Gray
BonAir dumps Colorado Lake 1159 x 878, Gray
City of Leadville Colorado Lake 1463 x 808, Gray
City of Leadville Colorado Lake 1237 x 838, Gray
City of Leadville Colorado Lake 1230 x 797, Gray
City of Leadville Colorado Lake 1270 x 826, Gray
Climax Mine Colorado Lake 1440 x 814, Gray
Hallenbeck placer Colorado Lake 1202 x 768, Gray
Harrison smelter Colorado Lake 1258 x 848, Gray
Mine dumps Colorado Lake 1257 x 789, Gray
Mine dumps Colorado Lake 1278 x 844, Gray
Mine tailings Colorado Lake Molybdenum 1536 x 1024, sRGB
Mine tailings Colorado Lake Molybdenum 1536 x 1024, sRGB
Moyer Mine Colorado Lake 1389 x 962, Gray
Moyer Mine Colorado Lake 1262 x 790, Gray
Moyer Mine Colorado Lake 1294 x 970, Gray
Moyer Mine Colorado Lake 1400 x 948, Gray
Penrose shaft Colorado Lake 1310 x 925, Gray
Placer diggings Colorado Lake 1217 x 802, Gray
Pyrenees shaft Colorado Lake 1288 x 877, Gray
Wolftone Mine Colorado Lake 1292 x 759, Gray
Wolftone Mine Colorado Lake 1274 x 926, Gray
Plaster Mill Colorado Larimer Gypsum 1220 x 921, Gray
Dutton and Halsey Mine Colorado Mesa Coal 822 x 1333, Gray
Oil Shale Mining Company retort Colorado Mesa Oil Shale 951 x 1282, Gray
Wells Gulch coal mine Colorado Mesa Coal 1243 x 857, Gray
Amethyst & Last Chance Mine Colorado Mineral 1317 x 895, Gray
C.F. & I. Mill Colorado Mineral 1242 x 897, Gray
C.F. & I. Mill Colorado Mineral Fluorspar 1289 x 750, Gray
C.F. & I. Mill Colorado Mineral Fluorspar 1240 x 895, Gray
City of Creed Colorado Mineral 872 x 1167, Gray
Equity fault Colorado Mineral 890 x 1163, Gray
Last Chance Mine Colorado Mineral 1317 x 881, Gray
New Cascade tunnel Colorado Mineral 1051 x 985, Gray
Blevin Mine Colorado Moffat Coal 1257 x 760, Gray
Blevin placer dredge Colorado Moffat Coal 1299 x 820, Gray
Blevin placer dredge Colorado Moffat Coal 1236 x 930, Gray
ColoWyo Coal Co Colorado Moffat Coal 1059 x 914, Gray
ColoWyo Coal Co Colorado Moffat Coal 1047 x 1031, Gray
ColoWyo Coal Co Colorado Moffat Coal 1036 x 997, Gray
ColoWyo Coal Co Colorado Moffat Coal 1062 x 1014, Gray
Evans Coal Mine Colorado Moffat Coal 853 x 1329, Gray
Gold dredge Colorado Moffat Gold 1177 x 895, Gray
Gold dredge Colorado Moffat Gold 834 x 1280, Gray
Gold dredge Colorado Moffat Gold 1253 x 820, Gray
Haughey Mine Colorado Moffat Coal 1255 x 820, Gray
Haughey Mine Colorado Moffat Coal 1255 x 859, Gray
James Mine Colorado Moffat 1233 x 914, Gray
Kimberly Mine Colorado Moffat 1207 x 848, Gray
Lay Mine Colorado Moffat 1236 x 852, Gray
Miller Mine Colorado Moffat 1173 x 957, Gray
Walker Mine Colorado Moffat 1231 x 860, Gray
U. S. Radium Co Colorado Montrose 1524 x 668, Gray
Barstow Mine Colorado Ouray 1324 x 861, Gray
Red Mountain Colorado Ouray 1283 x 920, Gray
Robinson Mine Colorado Ouray 1220 x 842, Gray
Sneffels mining camp Colorado Ouray 1536 x 1024, sRGB
Sneffels mining camp Colorado Ouray 1536 x 1024, sRGB
Virginius basin Colorado Ouray 1230 x 885, Gray
Gold dredge Colorado Park Gold 1255 x 842, Gray
Gold dredge Colorado Park Gold 761 x 1355, Gray
Gold dredge Colorado Park Gold 1236 x 803, Gray
South London Mine Colorado Park 1089 x 919, Gray
Aspen Contact Mine Colorado Pitkin 1245 x 902, Gray
Coalbasin Mine Colorado Pitkin Coal 1257 x 858, Gray
Leadville Mine Colorado Pitkin 1299 x 872, Gray
Redstone Coking Plant Colorado Pitkin Coke 1272 x 859, Gray
Spring Gulch mining camp Colorado Pitkin 1248 x 867, Gray
Fairfield Mine Colorado Rio Blanco Gold 847 x 1434, Gray
John Mackey No 2 claim Colorado Rio Blanco 768 x 1353, Gray
Lyon Canyon Coal Mine Colorado Rio Blanco Coal 1250 x 866, Gray
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1339 x 900, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1218 x 905, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1225 x 903, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1296 x 912, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1327 x 991, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1327 x 995, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1418 x 900, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1315 x 938, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1324 x 968, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1632 x 770, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1446 x 869, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1421 x 907, sRGB
Oil Shale tract C-a Colorado Rio Blanco Oil Shale 1377 x 936, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1447 x 832, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1323 x 918, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1232 x 977, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1419 x 918, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1542 x 830, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1324 x 982, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1404 x 940, sRGB
Oil Shale tract C-b Colorado Rio Blanco Oil Shale 1436 x 939, sRGB
Rector coal bank Colorado Rio Blanco Coal 1254 x 978, Gray
Rector coal bank Colorado Rio Blanco Coal 1316 x 933, Gray
Rector coal bank Colorado Rio Blanco Coal 1277 x 858, Gray
Sulphur Creek Mine Colorado Rio Blanco 1233 x 845, Gray
Summitville townsite Colorado Rio Grande 1231 x 818, Gray
Summitville townsite Colorado Rio Grande 1095 x 793, Gray
Tewsbury vein Colorado Rio Grande 914 x 967, Gray
Bear River Coal Co Colorado Routt Coal 1215 x 785, Gray
Brooks Coal Mine Colorado Routt Coal 1118 x 1038, Gray
Brooks Coal Mine Colorado Routt Coal 1192 x 918, Gray
Butcher Knife Coal Mine Colorado Routt Coal 771 x 1314, Gray
Curtis Coal Mine Colorado Routt Coal 1484 x 742, Gray
Curtis Coal Mine Colorado Routt Coal 1484 x 740, Gray
Curtis Coal Mine Colorado Routt Coal 1453 x 753, Gray
Distillation retort Colorado Routt 1310 x 798, Gray
Edna Coal Mine Co Colorado Routt Coal 1116 x 907, Gray
Edna Coal Mine Co Colorado Routt Coal 1084 x 902, Gray
Edna Coal Mine Co Colorado Routt Coal 1025 x 915, Gray
Edna Coal Mine Co Colorado Routt Coal 1015 x 971, Gray
Edna Coal Mine Co Colorado Routt Coal 1059 x 958, Gray
Edna Coal Mine Co Colorado Routt Coal 1037 x 977, Gray
Edna Coal Mine Co Colorado Routt Coal 1024 x 952, Gray
Edna Coal Mine Co Colorado Routt Coal 1087 x 977, Gray
Edna Coal Mine Co Colorado Routt Coal 1215 x 792, Gray
Energy Fuels No. 1 Mine Colorado Routt Coal 1125 x 941, Gray
Ernest Gwynn Mine Colorado Routt Coal 1159 x 1023, Gray
Federal Coal Co. mines Colorado Routt Coal 1370 x 796, Gray
Harris Mine Colorado Routt 1442 x 841, Gray
Hayden Coal Mine Colorado Routt Coal 1357 x 807, Gray
Juniper Coal Co Mine Colorado Routt Coal 1451 x 829, Gray
McCrosky Coal Mine Colorado Routt Coal 1102 x 896, Gray
Moffat Coal Co Colorado Routt Coal 1221 x 877, Gray
New Ducey (Block) Mine Colorado Routt Coal 1242 x 897, Gray
Pilot Knob mine Colorado Routt 1247 x 839, Gray
Pinnacle Coal Mine Colorado Routt Coal 1292 x 928, Gray
Placer gold diggings Colorado Routt Gold 1084 x 875, Gray
Steel tipple Colorado Routt 1327 x 802, Gray
California Gulch mine workings Colorado San Juan 1536 x 1024, sRGB
Collapsing mill Colorado San Juan 1536 x 1024, sRGB
Good Hope Silver Mine Colorado San Juan Silver 1536 x 1024, sRGB
Good Hope Silver Mine Colorado San Juan Silver 1536 x 1024, sRGB
Iowa Mine Colorado San Juan 1536 x 1024, sRGB
Iowa Mine Colorado San Juan 1536 x 1024, sRGB
Iowa Mine Colorado San Juan 1536 x 1024, sRGB
Leo J. Mine Colorado San Juan 924 x 1055, Gray
Royal Tiger Mine Colorado San Juan 1536 x 1024, sRGB
Silver Lake Mine Colorado San Juan 1536 x 1024, sRGB
Sunnyside Mine Colorado San Juan 1536 x 1024, sRGB
Sunnyside Mine Colorado San Juan 1536 x 1024, sRGB
Mine workings Colorado San Miguel 1536 x 1024, sRGB
Mine workings Colorado San Miguel 1536 x 1024, sRGB
Mining operations Colorado San Miguel 1536 x 1024, sRGB
Primos Chemical Co Adit No 2 Colorado San Miguel 1197 x 972, Gray
Primos Chemical Co Vanadium Mine Colorado San Miguel Vanadium 1239 x 945, Gray
Primos Chemical Co workings Colorado San Miguel Vanadium 987 x 1163, Gray
Primos Chemical Co workings Colorado San Miguel Vanadium 985 x 1196, Gray
Primos Chemical Co workings Colorado San Miguel Vanadium 953 x 1197, Gray
Radium group mine Colorado San Miguel Vanadium 1536 x 1024, sRGB
Rock of Ages Mine Colorado San Miguel 1362 x 885, Gray
San Bernardo Mill and Mine Colorado San Miguel 818 x 1251, Gray
Smuggler-Union mines Colorado San Miguel 921 x 990, Gray
Smuggler-Union mines Colorado San Miguel 1211 x 902, Gray
Smuggler-Union mines Colorado San Miguel 1290 x 793, Gray
Vanadium Mine Colorado San Miguel Vanadium 1536 x 1024, sRGB
Vanadium mine Colorado San Miguel Vanadium 1536 x 1024, sRGB
Boss mine dumps Colorado Summit 1272 x 925, Gray
Colorado Gold Dredging Co Colorado Summit Gold 1355 x 889, Gray
Colorado Gold Dredging Co Colorado Summit Gold 1311 x 889, Gray
Colorado Gold Dredging Co Colorado Summit Gold 1386 x 876, Gray
Congress Mine Colorado Summit 780 x 1558, Gray
Detroit Mine Colorado Summit 1346 x 820, Gray
Dredging operations Colorado Summit Gold 1285 x 799, Gray
Gold dredge Colorado Summit Gold 1199 x 880, Gray
Hydraulic elevator Colorado Summit 1199 x 831, Gray
Hydraulic workings Colorado Summit 1312 x 807, Gray
Hydraulic workings Colorado Summit Gold 1390 x 889, Gray
Hydraulic workings Colorado Summit Gold 1344 x 842, Gray
Jessie Mine Colorado Summit Gold 1286 x 807, Gray
Washington Mine Colorado Summit 1247 x 876, Gray
Wellington Mine Colorado Summit 1138 x 930, Gray
Wellington Mine Colorado Summit 1204 x 902, Gray
Wellington Mine Colorado Summit 1247 x 854, Gray
Wellington Mine Colorado Summit 1282 x 842, Gray
Wellington Mine Colorado Summit 1324 x 888, Gray
Wellington Mine Colorado Summit 1242 x 879, Gray
Altman & Last Dollar Mine Colorado Teller Gold 1380 x 855, Gray
Anaconda vein Colorado Teller 936 x 1180, Gray
Battle Mountain mines Colorado Teller 1367 x 895, Gray
Bull Hill Colorado Teller 1417 x 962, Gray
Bull Hill Colorado Teller 1413 x 938, Gray
Bull Hill Colorado Teller 1213 x 724, Gray
El Paso & Old Gold mines Colorado Teller 1320 x 918, Gray
Elkton Mine Colorado Teller 1379 x 881, Gray
Gold Hill Colorado Teller Gold 1308 x 917, Gray
Golden Cycle Mine Colorado Teller 1264 x 884, Gray
Golden Cycle Mine Colorado Teller 1171 x 837, Gray
Golden Cycle Mine Colorado Teller 1206 x 774, Gray
Goldfield Colorado Teller 1250 x 811, Gray
Joe Dandy Mine Colorado Teller 1464 x 922, Gray
Mary McKinney & Katinka Mines Colorado Teller 1422 x 886, Gray
Mineral Hill Colorado Teller 1428 x 867, Gray
Moose Mine Colorado Teller 1292 x 872, Gray
Morning Glory Mine Colorado Teller Gold 1354 x 914, Gray
Portland Gold Mining Company Mill Colorado Teller Gold 1255 x 841, Gray
Portland Gold Mining Company Mill Colorado Teller Gold 1181 x 779, Gray
Portland Gold Mining Company Mill Colorado Teller Gold 1182 x 895, Gray
Portland Gold Mining Company Mill Colorado Teller Gold 1384 x 844, Gray
Portland Mine Colorado Teller 916 x 1319, Gray
Portland Mine Colorado Teller 916 x 1296, Gray
Portland Mine Colorado Teller 844 x 1211, Gray
Raven Hill Colorado Teller Gold 1290 x 917, Gray
Raven Hill Colorado Teller 1341 x 939, Gray
Raven Hill Colorado Teller 1422 x 818, Gray
Vindicator & Lille mines Colorado Teller 1243 x 835, Gray
Dacono Mine Plant Colorado Weld 1262 x 923, Gray