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Historical map overlays

USGS scanned historical topographic maps. Enable an overlay and adjust its opacity. Works in 2D and 3D.

Sun azimuth: 315°   Sun altitude: 45°   Z factor: 1   Lidar opacity: 1
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Pittsburg Placer District — Sierra County

Gold Mining Site NM • Sierra County County
Description
NMBGMR mining district DIS202 (Pittsburg) — documented placer gold in Sierra County, New Mexico. Discovery circa 1901; gold occurs in Tertiary–Holocene alluvial fans, terrace gravels, and stream deposits per NMBGMR.
Historical Notes
McLemore (1994) lists Pittsburg among 36 New Mexico mining districts containing placer gold (NMBGMR Resource Map 24, district DIS202). Estimated placer production: roughly 8,000 ounces of placer gold from 1828–1991 statewide context (662,000 oz total NM placer production). Production period: 1902-1968. District cumulative production (all commodities): $220,000. Deposit types: placer gold. Also known as: Shannon, Apache Canyon, Las Palomas, Pittsburgh. Placer gold occurs as native gold and electrum in incised valleys and alluvial fans. Most economic placers were discovered by 1900; recreational panning may find fine colors — verify land status before prospecting. Coordinates approximate the district centroid from NMBGMR Resource Map 24 GIS (DIS202).
Status / Verification historical_site — Verified

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