Report on a geological reconnoissance sic of Cuba; made under the direction of General Leonard Wood, Military Governor
(This historic book may have numerous typos and missing te...)
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...having to mine it with the copper, separated it before hoisting the latter to the surface, and piled the blende back in the old workings. I have no doubt but that over 1,500 tons of this rich ore now lie in the dumps and old workings, requiring nothing but a handsorting to prepare it for the market.'1 As it was impossible to go down into the mines for reasons already stated, there was no opportunity to see this ore in any considerable quantity. The following analysis of specimens of the sulphide ore collected during this reconuoigsance was made by Frederic P. Dewey: Copper 8.36 per cent. Iron 57.34,,,, Gold.15 oz. per ton. Silver 4.7,,,,,, Lead by qualitative trace. Ansted says that some of the ores from this mine contain from 15 to 17 per cent, of copper. Mina Santa Elena.--The ore is similar to that in San Fernando, pyrites, chalcopyrite and sphalerite. The vein material is largely quartz. Mina Santa Isabela.--The vein here strikes N. 22 W. in diorite porphyry, the country rock, which shows much fracturing. The surface exposure is poor, but the vein is probably at least 15 feet wide. The surface rock is deeply iron stained, but no ore was seen in it. On the dumps, specimens of both carbonate and sulphide ores were found. Mina San Jose.--This mine is located on a vein, the vein material consisting largely of quartz, in diorite porphyry. The ores are sulphides. Water drawn from the bottom of the shaft at San Fernando is allowed to run through a trough over scrap iron, by which metallic copper is precipitated. The waters draining from the various mines contain much copper in solution, and flow into an arroyo skirting the northwestern side of the hill, where they cause a deposition of salts of copper; the basic sulphate is abundant, around pebbles and larger ...
https://www.amazon.com/geological-reconnoissance-direction-Military-Governor/dp/1130194752?SubscriptionId=AKIAJRRWTH346WSPOAFQ&tag=prabook-20&linkCode=sp1&camp=2025&creative=165953&creativeASIN=1130194752