RockWoof
Check access before you go. Most sites listed here are old mines, quarries or prospects, and many are on private land or active mining claims. Get the landowner's permission, check the rules of the agency that manages any public land, and never enter mine workings. Locations are approximate.

Sketch map

M & M Lime Co--Worthington, Pa. (Producer)Babcox & Wilcox Leechburg Plant (Past Producer)Nuclear Fuels Plant--Apollo, Pa. (Producer)Babcox & Wilcox Parks Twp Plant (Past Producer)Mccanna Lime Quarry (Producer)Unnamed Clay Mine + 1 more nearby (Past Producer)Clarion Horizon Plastic Clay of C (Unknown)
Past ProducerProducerProspectOccurrenceStatus unknown
7 paw pins; nearby sites are grouped into one pin. Hover or tap a pin for the site name. 1 site(s) with USGS coordinates outside the outline are not pinned. County outline: US Census Bureau cartographic boundary file (2023). Locations approximate.

Field cards: what kind of sites?

5
Past Producer

Produced ore or material at some point in the past.

3
Producer

Was producing when the record was made.

1
Unknown

Status not recorded.

Status terms come from USGS MRDS records.

Minerals recorded here

No individual minerals are listed in these records.

Commodities

Calcium 2Thorium 2Zirconium 1Aluminum 1Kaolin 1Flagstone 1

Sites

SiteCommodityMinerals recordedStatusApprox. location
Babcox & Wilcox Parks Twp PlantZirconium—Past Producer40.641, -79.535
Clarion Horizon Plastic Clay of C——Unknown40.933, -79.221
Alcoa Technical CenterAluminum—Past Producer40.563, -79.761
Mccanna Lime QuarryCalcium—Producer40.799, -79.422
Unnamed Clay MineKaolin—Past Producer40.647, -79.425
M & M Lime Co--Worthington, Pa.Calcium—Producer40.854, -79.673
Nuclear Fuels Plant--Apollo, Pa.Thorium—Producer40.587, -79.564
Babcox & Wilcox Leechburg PlantThorium—Past Producer40.625, -79.603
Unnamed Sandstone QuarryFlagstone—Past Producer40.647, -79.408

Fossil collections

The Paleobiology Database lists 2 fossil collection records in Armstrong County. These are research records, not public dig sites.

Nearby counties

Westmoreland County · Allegheny County · Butler County · Clarion County · Cambria County

Pennsylvania mineral guides

Back to all Pennsylvania counties.

Related articles

How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.

Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.

Updated