 No. 3 shaft, which afforded about 309 tons valued at $159,000, or $514 per ton. Approximately 59 tons of this averaged, according to Supt. Edgar A. Collins, 54.8 ounces of gold per ton, which is equivalent to a value of nearly $1,100. This ore, which...  Bulletin of the United States Geological Survey - Seite 38von Geological Survey (U.S.) - 1907Vollansicht - Über dieses Buch
 | 1907 - 874 Seiten
...ores of the grade now required for shipment are not likely to extend to as great a depth as 1 ,000 feet. Available workings certainly show a tendency...over $1,000 per ton are by no means uncommon. One of 14J tons from the Kendall mine is said by Mr. Spurr ° to have yielded $45,783 net in the preliminary... | |
 | Walter Richard Crane - 1908 - 798 Seiten
...: ; -s 3 Thepnx counties. *O3 U.^^®'Q * ^4®O) o H According to Mr. JE Spurr's estimate, in 1904, the average value of the ores mined in the Goldfield district was from $200 to $300 per ton and even more. The average value of shipping and milling ore in 1905 was about $200, and $40 to $50... | |
 | Walter Richard Crane - 1908 - 794 Seiten
...og S 5 8 3 SS "I £ 6 £ £ 1 B E S GOLD AND SILVER. According to Mr. JE Spurr's estimate, in 1904, the average value of the ores mined in the Goldfield district was from $200 to $300 per ton and even more. The average value of shipping and milling ore in 1905 was about $200, and $40 to $50... | |
 | Walter Richard Crane - 1908 - 794 Seiten
...'.'.':'. ° •a Thepn counties. — o H GOLD AND SILVER. According to Mr. JE Spurr's estimate, in 1904, the average value of the ores mined in the Goldfield district was from §200 to $300 per ton and even more. The average value of shipping and milling ore in 1905 was about... | |
 | Geological Survey (U.S.) - 1909 - 444 Seiten
...This ore, which was oxidized, contained only 1 ounce of silver to each 20 ounces of gold. JE Spurr b estimated in 1904 that the average value of the ores...from $40 to $50 per ton. Shipments averaging over 81,000 per ton are by no means uncommon. One of 14J tons from the Kendall mine is said by Spurr c to... | |
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