Contact-metasomatic magnetite deposit, Medfra Quadrangle, Alaska
Open-File Report
78-26
By: M.L. Throckmorton and William Wallace Patton
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Abstract
A small contact-metasomatic magnetite deposit was discovered in the Medfra quadrangle, Alaska, in 1976. It occurs at the contact between a Cretaceous or early Tertiary quartz monzonite stock and Paleozoic limestone and dolomite. The ore is a magnetite-clinohumite-hematite rock that contains up to 60 volume percent magnetite and 76 weight percent total iron expressed as FeO. Computer modelling of data derived from a ground-level magnetometer survey yielded an estimate of the shape and volume of the deposit. The volume is grossly estimated at 11,6003m .
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Contact-metasomatic magnetite deposit, Medfra Quadrangle, Alaska |
| Series title | Open-File Report |
| Series number | 78-26 |
| DOI | 10.3133/ofr7826 |
| Year Published | 1978 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | i, 13 p. |
| Country | United States |
| State | Alaska |
| Other Geospatial | Medfra Quadrangle |