Gap Nickel Mine
The Gap Nickel Mine is in Georgetown, Pennsylvania. Historically the site has been part of the Lancaster Area. The site was first discovered in 1718. The Gap Nickel Mine was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. The ore mined is composed of chalcopyrite, pentlandite and pyrite. The host rock in this area is norite. The Piedmont Upland of the Appalachian Highlands characterize the geomorphology of the surrounding area.
Additional textual information about a site or mine.
GAP DEPOSIT CONSISTS OF LENSES OF MASSIVE SULFIDES SURROUNDED BY ZONES OF DISSEMINATED SULFIDES NEAR THE BASE OF A TROUGH-SHAPED INTRUSION OF NORITE OR GABBRO, 2000 FEET LONG AND AS MUCH AS 800 FEET WIDE, THAT HAS BEEN METAMORPHOSED TO AMPHIBOLITE AFTER UNSUCCESSFUL ATTEMPTS TO MINE COPPER, IN 1852, IT WAS DISCOVERED THAT PYRRHOTITE, THROWN ON THE DUMPS AS WORTHLESS, CONTAINES MORE THAN 1% NICKEL. : UPDATE BY GLENN L. SHAFFER-1/75, RESERVES AND POTENTIAL RESOURCES. FURTHER UPDATE ON 7/75 TO SAME FIELDS.; INFORMATION SOURCE: 1 PUB LIT.
Formal or informal mining district names.
ORE MINERALS OCCUR ALONG CONTACT OF A METAMORPHOSED GABBRO MASS WITH PRECAMBRIAN MICA SCHIST. ORE DESCRIBED AS SIMILAR TO THAT AT SUDBURY, ONTARIO.
Physiographic area where the resource is found.
RESERVES UNKNOWN; MINE FULL OF WATER; EXPLORATION IN 1942 INDICATED MODERATE AMOUNT OF MATERIAL CONTAINING 0. 7% NICKEL AND 0. 4% COPPER. POOR INFORMATION REGARDING GRADE OF COBALT.
Other deposits in the same region.
Gap Nickel Mine
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Lancaster County Gold Occurrence
Landis Titanium Occurrence
Walter S. Schum Farm Prospect
Worth And Company Iron Mines
Hilton Farm Property
Beartown Iron Mine
Caernarvon Township Mines
Browns Chromium Mine
* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.
** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.
1 World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.
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FROM 1853 TO 1893, GAP MINE WAS PRINCIPAL NICKEL-CO PRODUCER IN NORTH AMERICA. IN 1876, THE GAP NICKEL MINE'S OUTPUT OF 200, 000 LBS. OF NICKEL REPRESENTED ONE-SIXTH OF THE WORLD'S PRODUCTION.