Little Mattie-Newton Group

The Little Mattie-Newton Group is a silver, lead, zinc, and gold mine located in Clear Creek county, Colorado.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Little Mattie-Newton Group  

State:  Colorado

County:  Clear Creek


Primary Mineral: Silver, Lead, Zinc, Gold

Lat, Long: 39.73306, -105.55667

Map: View on Google Maps

Satelite View

Satelite image of the Little Mattie-Newton Group

Little Mattie-Newton Group MRDS details

Site Name

Primary: Little Mattie-Newton Group
Secondary: General Thomas
Secondary: Decator
Secondary: Silver Glance
Secondary: Little Mattie
Secondary: Great Republican
Secondary: Newton
Secondary: Wild Rose


Primary: Silver
Primary: Lead
Primary: Zinc
Primary: Gold
Secondary: Copper


State: Colorado
County: Clear Creek
District: Chicago Creek area

Land Status

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Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Years of Production:
Significant: N


General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Model Name: Polymetallic veins


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Name: Porphyry
Role: Host
Age Type: Host Rock
Age Young: Tertiary

Name: Pegmatite
Role: Host
Age Type: Host Rock
Age Young: Proterozoic

Name: Gneiss
Role: Host
Age Type: Host Rock
Age Young: Proterozoic

Analytical Data

Not available


Ore: Chalcopyrite
Ore: Galena
Ore: Gold
Ore: Sphalerite
Ore: Tennantite
Gangue: Pyrite
Gangue: Quartz


Comment (Location): Little Mattie shaft is in SE/4 sec. 4, T 4 S, R 73 W, about 2-1/2 miles WSW of Idaho Springs.

Comment (Production): Gold and silver was produced from 1887 to 1892. From 1902 to 1951, gold production was 47,141.43 oz, silver was 361,996 oz, copper was 13,924 lb, lead was 264,725 lb, and zinc was 288,906 lb, from 188,652 tons of ore.

Comment (Production): Ore was produced from 17 levels over a range of 1700 feet elevation.

Comment (Reserve-Resource): Report dated 1981, potentially 660,000 tons of ore at 0.31 opt Au and 2.4 opt Ag.

Comment (Workings): The workings of the Little Mattie-Newton group include several shafts and 5 miles of drifts on 17 levels.

Comment (Commodity): Gangue contains carbonate minerals.

Comment (Commodity): Gold values predominate other metals.

Comment (Geology): The Little Mattie sulfide vein occupies a strong NE-trending fissure along bostonite porphyry dikes.


Reference (Deposit): Spurr, J. E., Garrey, G. H., and Ball, S. H., 1908, Economic geology of the Georgetown quadrangle, Colorado: U.S. Geological Survey Professional Paper 63, 422 p.

Reference (Deposit): BLM CONNECTING SHEETS

Reference (Deposit): USGS BULL. 1208, 1966

Reference (Deposit): USGS OPEN-FILE REPT. 835, 1966

Reference (Deposit): Harrison, J. E., and Wells, J. D., 1959, Geology and ore deposits of the Chicago Creek area, Clear Creek County, Colorado: U.S. Geological Survey Professional Paper 319, 92 p.

Reference (Deposit): Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.