Portland Tunnel Occurrence, Multnomah County, Oregon, USAi
| Regional Level Types | |
|---|---|
| Portland Tunnel Occurrence | Occurrence |
| Multnomah County | County |
| Oregon | State |
| USA | Country |
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Latitude & Longitude (WGS84):
45° 32' 20'' North , 122° 43' 58'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| West Haven | 6,009 (2016) | 3.7km |
| West Haven-Sylvan | 8,001 (2011) | 3.7km |
| Portland | 632,309 (2017) | 4.7km |
| West Slope | 6,554 (2016) | 5.1km |
| Kenton | 7,000 (2018) | 6.2km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Millennium Diggers Club | Portland, Oregon | 5km |
| Oregon Agate & Mineral Society, Inc. | Portland, Oregon | 5km |
| Columbia-Willamette Faceters' Guild | Portland/West Linn, Oregon | 20km |
| North American Research Group | Hillsboro, Oregon | 20km |
| Clackamette Mineral and Gem Club | Oregon City, Oregon | 22km |
According to the Oregon Dept. of Geology and Mineral Industries (1951, p. 141), a tunnel, which is now caved at the portal, was driven due west for 960 feet in nearly horizontal lavas of the Columbia River Basalt. Agglomeratic and bouldery interbeds in the lavas are common in this area and make up a large portion of the tunnel walls. The rocks have been more or less altered and in several places have been largely replaced by hematite. Silica has been deposited in some of the open spaces. The relatively unaltered basalts are cut by widely spaced hematitic seams striking a little east of north. Eleven samples taken from the altered rocks and hematitic seams assayed from a trace to one pound of mercury per ton.
REF:Deposit:: OR. DEPT. GEOL. AND MIN. INDUST. BULLETIN 14-D, 1952, P. 141
Deposit:: BROOKS, H. C., 1963, QUICKSILVER IN OREGON: OREGON DEPT. OF GEOLOGY AND MINERAL INDUSTRIES, BULL. 55, 223 P.112
Deposit:: MERCURY IN OREGON, 1965, USBM IC 8252 TABLE 26, P. 324.
Deposit:: FREDERICK, F., 1945, STATE OF OREGON MAP SHOWING LOCATION
Commodities (Major) - Mercury
Development Status: Occurrence
Host Rock Unit: Columbia River Basalt
Host Rock: Basalt
List of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10041035 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Cascade ArcVolcanic Arc
- Siletzia DomainDomain
- Western Washington–Oregon BasinsBasin
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