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File Created: 18-Oct-1988 by Sandra E. Dumais (SED)
Last Edit:  01-Jan-0001 by BC Geological Survey (BCGS)

Summary Help Help

NMI
Name KR 1 Mining Division Atlin
BCGS Map 114P057
Status Showing NTS Map 114P10E
Latitude 059º 32' 14'' UTM 08 (NAD 83)
Longitude 136º 38' 37'' Northing 6601024
Easting 407052
Commodities Gold, Silver, Copper Deposit Types
Tectonic Belt Insular Terrane Alexander
Capsule Geology

The KR 1 showing, 70 kilometres north-northeast of Haines, Alaska, was discovered in 1983 as a result of high gold values in panned silts. The Klehini River property is subdivided into two groups. This occurrence is in claim block KR 1 of the Beta Group. The occurrence is found between the Hubbard Fault and Denali Fault system of the Alexander Terrane. The area is underlain by complexly deformed, generally Paleozoic rocks. Locally, thermal metamorphism, resulting from the Oligocene Tkope River Intrusion, includes develop- ment of a hornfels texture, silicification, skarn mineralogy and re- crystallization. Quartz veining is restricted to the intrusion and probably formed from volatiles released at a later stage of the in- trusion. In this area the intrusion is a fine to medium-grained hornblende diorite with many large xenoliths of recrystallized wall- rock.

Veining consists of narrow, branching, poddy veins of highly sheared, friable, brecciated, hematite and limonite stained quartz in a sheared and clay altered diorite. The veins contain very minor disseminated pyrite, chalcopyrite, malachite, azurite and a black, manganiferous stain on fractures. They appear to occupy fault zones. The clay alteration appears to be of a tectonic derivation. The sheared and brecciated nature of the vein indicates there has been post vein movement on the fault.

The average vein thickness is about 0.45 metres. Of the two veins which comprise this occurrence, one strikes about 135 degrees with a dip of about 50 degrees to the north. The other vein does not have a measureable strike but also dips to the north.

The best assay from the quartz veins are 119.98 grams per tonne gold, 45.94 grams per tonne silver and 0.0322 per cent copper. The altered and sheared diorite wallrock have a best assay result of 1.20 grams per tonne gold, 1.37 grams per tonne silver and 0.0022 per cent copper (Assessment Report 14210).

Bibliography
EMPR ASS RPT *14210
GSC OF 926, 2191
EMPR EXPL 1986-C471

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