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

Unnamed Placers (Past Producer)Davis and Spaulding Property (Unknown)Delta Limonite Deposit (Past Producer)Iron Cap Mine (Past Producer)Thomas + 1 more nearby (Producer)Gunnison Forks (Past Producer)Atlas Mining Co Mine (Past Producer)Burdick Mine (Past Producer)Unnamed Placers (Past Producer)Molly Group + 1 more nearby (Occurrence)
Past ProducerProducerProspectOccurrenceStatus unknown
10 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.

Woof’s favorite find

Molly Group

We picked it because its USGS record mentions 2 gem or collectible minerals (Gold, Silver) and 2 of our card minerals overall. No other named site here scores as high on both counts. USGS lists it as unknown for Molybdenum. Minerals mentioned: Gold, Silver. Approx. location 39.110, -107.603. USGS record.

Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.

Field cards: what kind of sites?

7
Past Producer

Produced ore or material at some point in the past.

3
Unknown

Status not recorded.

2
Producer

Was producing when the record was made.

1
Occurrence

The mineral was noted here, without development.

Status terms come from USGS MRDS records.

Mineral cards

Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.

Minerals recorded here

Gold 2Limonite 1Molybdenite 1

Commodities

Sulfur 4Molybdenum 3Gold 2Iron 2Coal 1Aluminum 1

Sites

SiteCommodityMinerals recordedStatusApprox. location
Unnamed PlacersGoldGoldPast Producer38.742, -108.222
Unnamed PlacersGoldGoldPast Producer38.814, -107.688
Delta Limonite DepositIronLimonitePast Producer38.719, -107.899
Molly GroupMolybdenumMolybdeniteOccurrence39.117, -107.598
ThomasSulfur—Producer38.792, -107.846
Gunnison ForksSulfur—Producer38.792, -107.846
Atlas Mining Co MineSulfur—Past Producer38.735, -107.831
Burdick MineCoal—Past Producer38.891, -107.721
Molly GroupMolybdenum—Unknown39.110, -107.603
Gunnison ForksSulfur—Past Producer38.782, -107.841
Davis and Spaulding PropertyAluminum—Unknown38.777, -107.948
Iron Cap MineIron—Past Producer38.716, -107.888
Morelock MineMolybdenum—Unknown39.318, -107.564

Fossil collections

The Paleobiology Database lists 8 fossil collection records in Delta County. These are research records, not public dig sites.

Nearby counties

Gunnison County · Mesa County · Ouray County · Hinsdale County · Pitkin County

Colorado mineral guides

Back to all Colorado 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