Bulletin - United States Geological Survey Volume 587-588

Bulletin - United States Geological Survey Volume 587-588

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...in Matanuska and Talkeetna basins, with notes on placers of the adjacent region: U. S. Geol. Survey Bull. 314, pp. 121-125,1907. 48801--Bull. 087--10 12 obtained, and with the exception of a short tunnel, 20 to 25 feet in length, driven in the canyon of Lynx Creek, on a ledge showing narrow stringers of chalcopyrite, no further development work has been done. SILVER LODES. Assays of the gold quartz ores of this region show a silver content of as much as 25 ounces to the ton, although in but few assays is the value of the silver greater than the value of the gold. Practically all quartz gold carries some silver and it is possible that the galena, an important accessory mineral in these gold quartz ores, is also silver bearing. Nuggets of native silver are found in the gold-bearing gravels of Crow, Bear, and Palmer creeks, but so far as known native silver has not been found in any of the lode deposits. Silver prospects are reported only from Eagle River and Bear Creek. Mayflower lode, Eagle River.--The Mayflower lode, on the south side of Eagle River, at the foot of the Eagle River glacier, was discovered Junel, 1911, by J. P. Frisbie, William Murray, and M. S. McMelan. The outcrop of the ore body is well exposed on the recently glaciated surface of the massive graywacke country. The ore body consists of mineralized sheeted zones in the massive graywacke. These zones have a north-south strike, dip vertically, and have been traced about 400 feet on the south side of the river. Their continuation on the north bank is reported. They have a rusty appearance, resulting from the decomposition of the iron sulphides. Two of the zones, 50 feet apart, carry a few mineralized quartz stringers of variable width. The easternmost and widest of these...show more

Product details

  • Paperback | 144 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236930762
  • 9781236930767