NAMES OF MINES.
Location indicated on the map by numbers. NUMERICAL LIST. ALPHABETICAL LIST. 1. Bimetallist. Adams, 104. 2. Revenue Tunnel. Alabama, 116. 3. Wheel of Fortune. Alaska, 112. 4. U, S. Depository, Alexandra, 28. 5. Camp Bird (main adit). American, 101. 6. Hidden Treasure. American Girl, 18. 7. Camp Bird (upper adit). Anaconda, 89. 8. Hancock. Annie Wood, 122. 9. Japan. Anti periodic, 78., 10. Tomboy (main adit). Aspen, 77. 11. Tomboy (upper tunnel). Baltic Group (Mono), 136. 12. North Chicago. Barstow, 13. 13. Barstow. Belcher (Sultan Mountain), 52. 14. Little Candies. Belcher (Poughkeepsie Gulch). 108. 15 Meldrum Tunnel. Belle Creole, 97. 16. Silver Bell. Ben Franklin, 95. 17. Paymaster. Big Giant, 75. 18. American Girl. Big Ten, 81. 19. White Cloud. Bimetallist, 1. 20. Guston. Bonanza, 109. 21. Hammond Tunnel. Bonner, 45. 22. Yankee Girl. Brobdignad, 47. 23. Robinson. Buckeye, 68. 24. Scotch Girl. Butler, 119. 25. Grand Prize. Camp Bird (main adit), 5. 26. Midnight. Camp Bird (upper adit), 7. 27. Carbonate King. Carbonate King, 27. 28. Alexandra. Carbon Lake, 39. 29. Genesee-Vanderbilt. Charter Oak, 32. 30. Summit. Columbia, 107. 31. Webster. Congress, 40. 32. Charter Oak. Dewey, 84. 33. National Belle. Dives, 70. 34. Lake (Red Mountain). Dolly Vard«n, 127. 35. Hudson. Early Bird, 118. 36. Galena Queen. Empire Tunnel, 54. 37. Mineral King. Forest, 132. 38. Henrietta. Frank Hough, 129. 39. Carbon Lake. Galena Queen, 36. 40. Congress. Genesee-Vanderbilt, 29. 41. St. Paul. George Washington, 99. 42. Silver Ledge. Gold King (and Sampson), 100. 43.. Silver King. Gold King (lowest tunnel), 102. 44. Silver. Crown. Gold Nugget, 85. 45. Bonner. Grand Prize, 25. 46. Magnet. Green Mountain, 72. 47. Brobdignad. Guadaloupe, 138. 48. Irene. Guston, 20. 49. Zuni. Hamlet, 86. 50. Yukon Tunnel. Hammond Tunnel, 21. 51. North Star. Hancock, 8. 52. Belcher (Sultan Mountain). Henrietta, 38. 53. Montezuma. Hidden Treasure, 6. 54. Empire Tunnel. Highland Mary, 69. 55. Idaho. Hudson, 35. 56. Lackawanna. Idaho, 55. 57. King. Iowa, 66. 58. Molas. Irene, 48. 59. Mabel. Japan, 9. 60. Montana. J. J. Crooke, 126. 61. Little Ray. J. I. C., 135. 62. Titusville. King, 57. 63. Nevada. Lackawanna, 56. 64. Unity Tunnel. Lake, 98. 65. 'Silver Lake.. Lake (Red Mountain), 34. 66. Iowa. Little Candies, 14. 67. Royal Tiger. Little Giant, 76. 68. Buckeye Little Maud, 83. 69. Highland Mary. Little Ray, 61. 70. Dives. Mabef;- :59. 71. North Star (King Solomon). Magnet, 46. 72. Green Mountain. Maid of the Mist, 131. 73. Philadelphia. Mammoth, 121. 74.-Pride of the West. Mastodon, 93. 75. Big Giant. Meldrum Tunnel, 15. 76. Little Giant. - Micky Breen, 139. 77. Aspen. Midnight, 26. 78. Anti periodic. Mineral King, 37. 79. Veta Mad re. Mohawk, 125. 80. Neigold. Molas, 58. 81. Big Ten. Montana, 60. 82. Ridgway. Montezuma, 53. 83. Little Maud. Mountain Queen, 106. ,84;.Dewey. National Belle, 33. 85. Gold Nugget. Neigold, 80. 86. Hamlet. Nevada, 63. 87. Tom Moore. North Chicago, 12. 88. Toltec, North Star, 51. 89. Anaconda. North Star (King Solomon), 71. 90. Scotia and Golden Fleece. Old Lout, 133. 91. Sound Democrat. Old Lout Tunnel, 134. 92. Silver Queen (Placer Gulch). Palmetto, 128. 93. Mastodon. Paymaster, 17. 94. Sunnyside Extension. Philadelphia, 73. 95. Ben Franklin. Polar Star, 124. 96. Sunnyside. Poughkeepsie, 115. 97. Belle Creole. Pride of Syracuse, 123. 98. Lake. Pride of the West, 74. 99. George Washington. Queen Anne, 105< 100. Gold King (and Sampson). Red and Bonita, 103. 101. American. Red Cloud, 117. 102. Gold King (lowest tunnel). Red Roger* 110. ( 103. Red and Bonita. Revenue Tunnel, 2. 104. Adams. . Ridgway, 82. 105. Queen Anne. Robinson, 23. 106. Mountain Queen. Royal Tiger, 67. 107. Columbia- St. Paul,'41. 108. Belcher (Poughkeepsie Gulch). San Juan Chief, 120. 109. Bonanza. Saratoga, 137. 110. Red Rogers. Saxon and Amador, 113. 111. Seven-Thirty. Scotch Girl, 24. 112. Alaska. Scotia and Golden Fleece, 90. 113. Saxon and Amador. Seven-Thirty, 111. 114. Tempest. Silver Bell, 16. 115. Poughkeepsie. Silver Crown, 44. 116. Alabama. Silver King, 43. 117. Red Cloud. Silver Lake, 65. 118. Early Bird. Silver Ledge, 42. ,119. Butler. Silver Link, 140. 120. San Juan Chief. Silver Queen (Placer Gulch), 92. 121. Mammotf). Silver Queen (Bear Creek), 141. 122. Annie Wood. Sound Democrat, 91. 123. Pride of Syracuse. Summit, 30. 124. Polar Star. Sunnyside, 96. 125. Mohawk. Sunnyside Extension, 94. 126- J. J. Crooke. Sunset, 130., 127. Dolly Varden. Tempest, 114. 128. Palmetto. Titusville, 62. 129. Frank Hough. Toltec, 88. 130. Sunset. Tomboy (main adit), 10. 131. Maid of the Mist. Tomboy (upper tunnel), 11. 132. Forest. Tom Moore, 87. 133. Old Lout. Unity Tunnel, 64. 134. Old Lout Tunnel. U. S. Depository, 4. 135. J. I.C. Veta Mad re, 79. 136. Baltic Group (Mono). Webster, 31. 137. Saratoga. Wheel of Fortune, 3. 138. Guadaloupe. .White Cloud, 19. 139. Micky Breen. Yankee Girl, 22. 140. Silver Link. Yukon Tunnel, 50. 141. Silver Queen (Bear Creek). Zuni, 49. OLUM-MA] iTIO
GENERALIZED SECTION FOR THE SILVERTON QUADRANGLE. SCALE: 1 !NCH = 10CO FEET.
COLUMNAR THICKNESS SYSTEM. FORMATION NAME. SYMBOL. SECTION. IN FEET. CHARACTER AND DISTRIBUTION OF FORMATIONS.
~~ ~"~~ :^~=SiSa Sii^ag =3i^2Z: An alternation of rhyolite and quartz-latite flows and tuffs, the flows predominating near the base. ^S. *. > a- -a. Some of the thin upper flows seen in Potosi Peak are glassy. A thin augite-andesite sheet occurs Potosi volcanic series. , 2L ""^ ^=^ 1250 in the lower portion. Thirteen hundred feet is the maximum thickness preserved in the quad -==-??>:> ^^ rangle.
intor>»ii-r>r>MlTV 5ffP^2253> > ' " .*"* f :
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? .* T ; A succession of andesite flows and tuffs, also dikes, characterized by the presence of both augite Pyroxene-andesite. Tpa 100-3000 and hypersthene. Forms the upper member of the Silverton series and has its greatest known -4 ^ ^ «
-y *Jr~? i"~* g-g-y UNCONFORMITY Silvertonvolcanicseries.
TERTIARY A Burns latite. Tb ^ ' Jf i A succession of flows, tuffs, and breccias, and dikes of dark hornblendic quartz-bearing latite, of 1200 andesitic habit. Several varieties, of local distribution, have been observed.
1 1 KI r*nw rnnn ITW ^s^.'b ..-avr. Picayune andesite. Tpy 500 ' Augite-andesite occurring in tuff, breccia, or agglomerate, and massive flows. The earliest known member of the Silverton series. Imperfectly exposed. Base not known. - UNCONFORMITY '.'.*;..-*;-:v;.v^ Almost exclusively of andesitic d6bris. Near the base it is a well-stratified tuff, but becomes coarser and less distinctly bedded in its upper portion. Fossils are not known. The beds vary greatly San Juan tuff. Tsj 100-2000 in thickness, owing both to primary causes and to the erosion preceding the eruptions of the Silverton series. The maximum thickness observed in the Silverton quadrangle is adjacent to 4' 'i^'. 4 '.' ' " '* ' ' -4 Canyon Creek. . -. .< ,. . .; /.'. .' :V.K-V-^ UNCONFORMITY * A coarse conglomerate containing pebbles and bowlders of schist, granite, and quartzite with some / 0-200 limestone and the harder sediments of the Paleozoic formation. Thickens westward until it Telluride conglomerate. Tt becomes a series of conglomerates, grits, sandstones, and shales, nearly 1000 feet in thickness. iifcirTuurrtDMiTx/ ijiu^V^Xv; A complex of bright-red sandstones and lighter red or pinkish grits and conglomerates alternating Cutler formation. Cc 1000+ with sandy shales and earthy or sandy limestones of varying shades of red. PENNSYLVANIANPERMIAN? Rico formation. Cr 300 Dark reddish-brown sandstone and pink grits, with intercalated greenish or reddish shale and CARBONIFEROUS sandy, fossiliferous limestone. j , i , i ,1 ,,..,i >:: ;: ': v\'/V.'-y.-' / A series of limestones, grits, sandstones, and shales, of variable distribution and development. Limestone in thick massive beds predominates in the middle and upper parts of the section, the Hermosa formation. Ch ' .' .' ' ':' :!''"'->Vv:^:: 2000 lower portion being mainly sandstone and shale with a few limestone layers. Numerous inverte brate fossils occur in shale and limestone. i.i.i'. 1 ' i > ' , i , i '.' ' ' ' ' ' ' ' ' '; "Red calcareous shale and sandstone with chert, limestone, and quartzite pebbles and thin fossilif / 15 erous limestone lenses. The chert and limestone pebbles often contain fossils from the Mississip- Molas formation. - Cm\ pian portion of the Ouray limestone; the limestone lenses carry Pennsylvanian species. MISS'P'N UNCONFORMITY Pale-yellow to buff compact limestone; lower third shaly, with thin quartzites; abundant fossils Ouray limestone. DCo 200+ indicate Devonian age of lower two-thirds and Mississippian age of upper part. DEV. Elbert formation. De/ \ 25-100 Thin limestone and sandstone, and calcareous shale containing casts of salt crystals. Contains UNCONFORMITY ^p^MP^i fragmentary fish remains locally in Needle Mountains, demonstrating Devonian age. CAMB. Ignacio quartzite. i/ Quartzite, massive and conglomeratic hi the lower part, thin bedded with shale or sandy partings UNCONFORMITY \ 0-200 in the medial zone, succeeded by more massive quartzite. Light gray, pink, or yellow predom xs inates. One shell, Obolus sp ?, has been found near the middle of the formation. iWiB l^-fe^sS ALGONKIAN BIBil Massive white or smoky quartzite and dark slate, with a few members in which those rocks alter Uncompahgre formation. Au 8000+ nate in thinner layers. No fossils have been found. si^^&^ " ^\' ' N&^C ' ' ;;^^ ARCHEAN? Schist and gneiss, of dark and light'colors, often in alternating bands. Intruded by granite and Schist and gneiss. /Rs pi cut by basic dikes, many of which have been mashed. WHITMAN CROSS, EKNEST HOWE, Geologists. ILLOITIRATIO: U. S. GEOLOGICAL SURVEY COLORADO CHARLES D. WALCOTT, DIRECTOR SILVERTON QUADRANGLE FIG. 1. VIEW FROM SNOWDON PEAK NORTH TOWARD SILVERTON. FIG. 2. VIEW DOWN IRONTON PARK FROM MOUTH OF GRAY COPPER GULCH. In the center lies Molas Lake, underlain by Ouray limestone. On the deforested slope to the left are ledges of Carboniferous limestone. Above these rise Grand Turk and other mountains of San The nearly level park extends for 1£ miles from view point. On the right are Saratoga mill and mine buildings, where Algonkian quartzites and overlying Paleozoic beds appear. On the left is fan of Juan tuff. To the right of the lake is the line of Animas Canyon, with Kendall Mountain beyond Full Moon Gulch, with Carboniferous sandstone at the road level on either side. Above, on Hayden Mountain, appear characteristic cliffs of San Juan tuff. 11plfi4T^S* v -' - 0 FIG. 3. TALUS PILES IN EASTERN BRANCH OF HORSESHOE BASIN. FIG. 4. ROCK STREAM IN SILVER BASIN. FIG. 5. TORRENTIAL FANS ON SOUTH SIDE OF RIO GRANDE BELOW DEEP CREEK, FROM SLOPE OF SHEEP MOUNTAIN. Shows relation of talus and cliff where a snow bank against foot of cliff is supposed to have aided in Shows sharp definition of stream and indicates its great volume as compared with talus piles below right-hand cliffs. These cliffs of Potosi lavas are similar in material and height to the accumulation of debris at some distance from cliff. This mass grades into rock stream at its those whence the material of the rock stream came. >, ' Ravines cutting into forested hillside of San Juan tuff are depositing most of their detritus in torrential upper end. fans below. FIG. 6. LANDSLIDE "SURFACE BELOW RED MOUNTAIN NO. 2, FROM FAN AT MOUTH OF GALENA LION GULCH. FIG. 7. LANDSLIDE AREA OF RED MOUNTAIN CREEK NEAR ROBINSON AND GUSTON MINES. Shows multitude of small slide blocks. This slide area extends across ridge from Red Mountain No. 2 into Corkscrew Gulch. On the left is the knoll above Paymaster mine. In the foreground View is up creek from knoll north of Robinson mine, in foreground. All is landslide area but the distant cliffs. On the right the blocks are larger and of comparatively fresh rock. On the left the are White Cloud and American Girl mines. blocks are small and much disintegrated. A small knob of silicified rock appears beside Robinson shaft.