The Molalla High-Alumina Clay is a kaolin, aluminum, and iron mine located in Clackamas county, Oregon.
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
Elevation:
Commodity: Kaolin, Aluminum, Iron
Lat, Long: 45.05556, -122.55556
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Molalla High-Alumina Clay MRDS details
Site Name
Primary: Molalla High-Alumina Clay
Secondary: Ellis and Dibble Deposits
Commodity
Primary: Kaolin
Primary: Aluminum
Primary: Iron
Location
State: Oregon
County: Clackamas
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1911
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Northern Cascade Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Clay, Mud
Role: Host
Age Type: Host Rock
Age Young: Pliocene
Name: Clay, Mud
Role: Host
Age Type: Host Rock Unit
Age Young: Pliocene
Analytical Data
Not available
Materials
Ore: Kaolinite
Ore: Montmorillonite
Ore: Halloysite
Comments
Comment (Deposit): FOUR ORE BODIES
Comment (Development): RATIO OF OVERBURDEN OF 2:1. USBM SAMPLED EXTENSIVELY IN 1942 AND 1943
References
Reference (Deposit): OREGON METAL MINES HANDBOOK, 1951, ODGMI BULL. 14-D, P. 20
Reference (Deposit): NICHOLS, R.L., 1944, PRELIMINARY REPORT ON THE MOLALLA HIGH-ALUMINA CLAY DEPOSIT NEAR MOLALLA, CLACKAMAS COUNTY, OREGON; USGS STRATEGIC MINERALS INVESTIGATIONS
Oregon Gold
"Where to Find Gold in Oregon" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in Oregon. Read more: Where to Find Gold in Oregon.
