Sugar Daddy

Mine, Active

Commodities and mineralogy

Main commodities Au
Ore minerals gold; magnetite
Gangue minerals limonite; quartz

Geographic location

Quadrangle map, 1:250,000-scale BD
Quadrangle map, 1:63,360-scale D-4
Latitude 64.9606
Longitude -145.8647
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Sugar Daddy gold deposit is located about 9 miles southeast of Chena Hot Springs resort; about 0.2 mile from the center of section 35, T. 1 N., R. 10 E., of the Fairbanks Meridian (Bohan, 2013). Accurate within about 1/4 mile.

Geologic setting

Geologic description

The Sugar Daddy gold deposit is a placer deposit on Ottertail Creek containing gold bearing gravels, benches, plus immense rust oxidized zones of crumbly weathered bedrock. The placer gravels also overlie a shallow gold lode deposit (Bohan, 2013).
The placer gold is associated with sulfides composed of partially oxidized to limonite and magnetite. The lode gold is hosted in a garnet-bearing phyllite to phyllitic schist. The gold-bearing sulfides are layered in mineralized zones along quartz reef-like fissure veins and surrounding in foliated boudinaged veins. Refractory gold also exists within the fissure lode quartz. The placer is a combination of gravel concentrates plus the weathered lode rock that lies beneath the pay leads (Bohan, 2013).
The placer contains both coarse and fine gold. The larger, coarse nuggets come from stacked fissure veins within a zone of boudinaged quartz in a garnet schist. The finer equigranular gold nuggets come from a skarn deposit and a monzonite pluton located on the north claim blocks (Bohan, 2013).
Pegmatite with the gemstone schorl (black tourmaline) is also found in float cobbles. This sodium, iron rich tourmaline is notable in that its presence suggests that boron is introduced into the hornfels facies contact system (Bohan, 2013).
Geologic map unit (, )
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Placer gold mineralization is Quaternary in age (Weber and others, 1978).
Alteration of deposit Iron oxidation (Bohan, 2013).

Production and reserves

Workings or exploration Sugar Daddy gold load/placer is at the greenfields stage of exploration and has had very little exploration completed. The 2010-2013 field season yielded gold reserves from 65 cubic yards of gravel washed per ounce of gold to 45 cubic yards of gravel moved (Bohan, 2013).
Indication of production Yes; small
Production notes A six-inch suction dredge was used for sampling on the Sugar Daddy prospect on Ottertail Creek in 2002. Later in 2004, an industrial dredge replaced the six-inch and can run 2-4 yards per hour (Bohan, 2013).

Additional comments

Gold recovery will be estimated 45 cubic yards gravel washed per ounce of gold recovered on high grade pay leads. The lower grade end of gold leads should average 65 cubic yards of gravel washed per ounce of gold recovered (Bohan, 2013).

References

References

Bohan, W.R., 2013, Geologic Reconnaissance of the Sugar Daddy Gold Deposit at Ottertail Creek and Vicinity, Big Delta D-4 Quadrangle Alaska, unpublished report (copy held at Alaska Earth Sciences, Inc., Anchorage, AK).
Reporters V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 12/9/2014