Hagelbargers Pass Occurrence, Bristol Bay Mining District, Kodiak Island Borough, Alaska, USAi

Regional Level Types
Hagelbargers Pass Occurrence	Occurrence
Bristol Bay Mining District	Mining District
Kodiak Island Borough	Borough
Alaska	State
USA	Country

This occurrence is in Katmai National Monument.
Location: This occurrence is about 3.5 miles northwest of Hagelbargers Pass near the headwaters of Katmai River. It is at an elevation of about 1,300 feet in the SW1/4 sec. 31, T. 22 S., R. 33 W., of the Seward Meridian. The location is accurate within one-half mile.
Geology: This occurrence is in Upper Tertiary, propylitically-altered, volcanic rocks, that contain banded quartz veins, generally one to five mm thick and finely disseminated pyrite (Church, Riehle, and Goldfarb, 1993). The veins contain quartz, smectite-illite mixed-layer clay, and stilbite. Samples generally contain from 0.15 to 0.45 parts per million (ppm) gold with a maximum value of 2.2 ppm, and up to to 300 ppm arsenic, 200 ppm molybdenum, and 3 ppm silver. The dark color of the quartz bands is due to finely dispersed jordisite (MoS2) (Church, Riehle, and Goldfarb, 1993). The occurrence may represent veining above a concealed low-F porphyry Mo deposit (Church, Riehle, and Goldfarb, 1993).
Workings: Apparently only sampling by government geologists.
Age: Late Tertiary or younger; the veins are in the volcanic rocks of the Aleutian volcanic arc.
Alteration: Wall rocks are propylitically altered and contain disseminated pyrite.

Commodities (Major) - Au; (Minor) - Ag, As, Mo, Zn
Development Status: None
Deposit Model: Polymetallic vein, epithermal gold vein (Cox and Singer, 1986; model 22c, 25).

Other Databases

Link to USGS - Alaska:	MK021

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References