Keystone, California

The same ground, surveyed 84 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1916 2000

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1916 USGS Copperopolis quadrangle1:62500, 3 printings
• 1942 USGS Copperopolis quadrangle1:62500
• 1947 USGS San Jose quadrangle1:250000
• 1954 USGS Copperopolis quadrangle1:62500
• 1956 USGS San Jose quadrangle1:250000
• 1962 USGS Copperopolis quadrangle1:62500, 2 printings
• 1962 USGS Keystone quadrangle1:24000, 2 printings
• 1962 USGS San Jose quadrangle1:250000, 4 printings
• 1966 USGS San Jose quadrangle1:250000
• 1994 USGS Oakdale quadrangle1:100000, 2 printings
• 2000 USGS Keystone quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 251 fires within 5 miles of Keystone between 1992 and 2020, burning about 18,022 acres in total. 16 started naturally. 12 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Settlements close enough to share some of these fires:

• Hetch Hetchy Junction
• Yosemite Junction
• Black Jack Bluffs
• Campo Seco
• Chinese Camp
• Montezuma

Every fire recorded in Tuolumne County

Regional context, not property-specific evidence. The federal mineral resources record lists 66 workings within 5 miles of Keystone: 28 past producers, 15 producers, 10 occurrences, 10 prospects. 15 still produce. What was taken out: Chromium, Gold, Magnesite, Copper. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Tuolumne County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 252712. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.