Took a bit to establish what location this actually is but after checking and cross references it appears to be
Mining location KC133* (in section 25 on attached map) - which is part of the Annette Island Indian Reservation.
References:
https://www.mindat.org/loc-23239.htmlhttps://mrdata.usgs.gov/ardf/show-ardf.php?ardf_num=KC133 Location and accuracy- This occurrence, described only vaguely in early reports, is said to to be near the head of Annette Bay. The site is in section 25, T. 76 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 130 in Elliott and others (1978). The location is probably accurate within 0.5 mile.
This unknown location is Officially an "Unnamed Occurrence (ARDF - KC133), Annette Bay, Annette Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USA"
Commodity Mined - SB = Antimony * or Sulfide of antimony.
"It has long been known that stibnite, the sulfide of antimony and the principal source of that metal, is widely distributed in Alaska," Alfred Brooks penned in a 1917 report, Antimony deposits of Alaska.Dec 23, 2020
Antimony Definition and detail:
https://en.wikipedia.org/wiki/AntimonyAntimony is a chemical element with the symbol Sb (from Latin: stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name kohl.[5] The earliest known description of the metal in the West was written in 1540 by Vannoccio Biringuccio.
China is the largest producer of antimony and its compounds, with most production coming from the Xikuangshan Mine in Hunan. The industrial methods for refining antimony from stibnite are roasting followed by reduction with carbon, or direct reduction of stibnite with iron.
The largest applications for metallic antimony are in alloys with lead and tin, which have improved properties for solders, bullets, and plain bearings. It improves the rigidity of lead-alloy plates in lead–acid batteries. Antimony trioxide is a prominent additive for halogen-containing flame retardants. Antimony is used as a dopant* in semiconductor devices.....
(*A dopant, also called a doping agent, is a trace of impurity element that is introduced into a chemical material to alter its original electrical or optical properties. The amount of dopant necessary to cause changes is typically very low.)
So this is what that location appears to be!
Norm