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Assay Office Records, Eberhardt & Aurora MC, LTD, 1871-2 [167526]

Currency:USD Category:Books / Antiquarian & Collectible Start Price:1,000.00 USD Estimated At:2,000.00 - 5,000.00 USD
Assay Office Records, Eberhardt & Aurora MC, LTD, 1871-2 [167526]
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Assay Office Records, Eberhardt & Aurora MC, Ltd, 1871-8, 384pp, possibly complete, but not checked. 8 x 14" format. Binding gone, string bound, rough. All content except first page are clear. This book is a formal record of all assays at the International Mill at Eberhardt City in White pine, near Treasure Hill and Hamilton. In it are samples from: stamp mill batteries with date; mine samples, mill samples, tailings samples, wet and dry pulps from the concentrated ore. The ore concentrates are generally running about 60 to 90m ounces per ton silver. The tails were rich by todays standard, running ten to twenty ounces per ton. Assayers were: 1872: W.G. Gallagher; 1873: Sven Gumbinner; 1874: same; 1875 ; same; June 1876- Frank Hallowell; 1876- same; 1877- same; 1878- same. Production appears to have been minimal in 1875 and greatly picked up in 1876. it was again minimal in 1877 picking up in 1878.

The Eberhardt and Aurora were the richest mines at White Pine, producing over $7 million between them by 1878, the final year, according to Couch & Carpenter. These two mines accounted for $7 of $9 million produced during that period.

The international mill was built in 1870. Interestingly, Hose and Blake in Geology and Mineral Resources of White pine County (1976) differ substantially from the data Couch & Carpenter presented. These authors discuss the discovery and progression of production in far better detail (rather than just numbers), discussing how the Eberhardt & Aurora company spent $5 million trying to find a larger ore body, and gave up about 1885 about the time the town of Hamilton was burned down.

This is an important factual record of mine and mill sampling and thus of ore concentrates and tailings. Individual pages from other volumes have sold for as much as $45 each.

Date:
Country (if not USA):
State: Nevada
City: Eberhardt City, White Pine
Provenance: