Unnamed (in Morelock Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu; Pb; Sn; W; Zn
Ore minerals arsenopyrite; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale TN
Quadrangle map, 1:63,360-scale B-3
Latitude 65.31669
Longitude -151.32126
Nearby scientific data Find additional scientific data near this location
Location and accuracy This record represents a lode prospect exposed in the placer workings in Morelock Creek (TN033) (Cobb, 1972). The site of the Morelock Creek placer mine and lode prospect is at the cabin adjacent to the creek, at the east edge of section 30, T. 6 N., R. 18 W., of the Fairbanks Meridian.

Geologic setting

Geologic description

Bedrock in the area of the Morelock Creek gold-cassiterite ('tin') placer deposit consists of greenstone, metachert, dolomite, marble, calcareous schist, and siliceous mica schist (Mertie, 1934; Chapman and others, 1982). Although granitic rocks were reported by Eakin (1916), none were found in later mapping by Chapman and others (1963, 1982). The bedrock is complexly folded, faulted, and locally cut by sulfide-bearing quartz-calcite veins (Thomas and Wright, 1948 [RI 4322]; North Star Exploration, Inc., 1999 [Report 99-34]).
WGM, Inc., and Union Carbide Corporation respectively explored the Morelock Creek area from 1975 to 1979 and in 1982. Placer Dome had a joint venture with Doyon, Ltd., in 1988-89. North Star Exploration, Inc. (1999 [Report 99-34]) explored Doyon block 20 in 1998, and reported that Morelock Creek (along with other prospects) had potential for stockwork and vein gold deposits. Trenching of some of the placer deposits exposed mineralized quartz-calcite veins. Placer Dome (1989) reported geochemical anomalies that included gold, silver, tin, tungsten, lead, zinc, and trace amounts of copper.
The Morelock Creek vein system is oriented along a northwesterly trend (Placer Dome, 1989). It is at least 500 feet long and 25 feet wide. Placer Dome described the system as heavily fractured, structurally controlled, and containing quartz, calcite, and arsenopyrite. In one 25-foot interval, the mineralization graded 0.08 ounce of gold per ton, or more than 2.5 grams of gold per ton. The highest value was 0.10 ounce of gold per ton in a 7 foot interval. A select sample containing 25 percent arsenopyrite and 15 percent pyrite reportedly contained 5,030 parts per billion gold (about 0.15 ounce of gold per ton).
Reconnaissance soil sampling to the east in the lower Morelock Creek area showed locally anomalous lead and zinc values (North Star Exploration, Inc., 1999 [Report 99-34]). Extensive stockwork vein systems have been identified in association with the faults in the Morelock Creek area, including the intersection of a northwest fault with northeast-trending faults in the Rosa Creek and Quartz Creek drainages (North Star Exploration, Inc., 1999 [Report 99-34]).
Geologic map unit (-151.323776499292, 65.3161865917152)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a

Production and reserves

Workings or exploration
WGM, Inc., and Union Carbide Corporation respectively explored the Morelock Creek area from 1975 to 1979 and in 1982. Placer Dome had a joint venture with Doyon, Ltd., in 1988-89. North Star Exploration, Inc. (1999 [Report 99-34]) explored Doyon block 20 in 1998, and reported that Morelock Creek (along with other prospects) had potential for stockwork and vein gold deposits. Trenching of some of the placer deposits exposed mineralized quartz-calcite veins. Placer Dome (1989) reported geochemical anomalies that included gold, silver, tin, tungsten, lead, zinc, and trace amounts of copper.
The Morelock Creek vein system is oriented along a northwesterly trend (Placer Dome, 1989). It is at least 500 feet long and 25 feet wide. Placer Dome described the system as heavily fractured, structurally controlled, and containing quartz, calcite, and arsenopyrite. In one 25-foot interval, the mineralization graded 0.08 ounce of gold per ton, or more than 2.5 grams of gold per ton. The highest value was 0.10 ounce of gold per ton in a 7 foot interval. A select sample containing 25 percent arsenopyrite and 15 percent pyrite reportedly contained 5,030 parts per billion gold (about 0.15 ounce of gold per ton).
Indication of production None
Production notes North Star Exploration, Inc. (1999 [Report 99-34]) reported that the Morelock Creek placer mine (TN033) (which is in Block 20 of the Doyon, Ltd., holdings) produced most of the 11,400 ounces of gold credited to the Gold Hill-Melozitna mining district.

Additional comments

Morelock Creek flows through lands selected by or conveyed to Doyon, Ltd. For further information, contact Doyon, Ltd., at 1 Doyon Place, Suite 300, Fairbanks, Alaska, 99701-2941.

References