Galena, Alaska located on the Yukon River between the Koyukuk River and the Nowitna River. Galena was established in 1918 near an Athabascan fish camp called Henry's Point. It became a supply and point for nearby lead ore mines that opened in 1918 and 1919. In 1941 and 1942, during World War II, a military air field was built adjacent to the civilian airport, and the two facilities shared the runway and flight line facilities. This air field was designated Galena Air Force Station shortly after the split of the United States Air Force from the United States Army, which occurred as
Mineral Rock forming minerals – typically silicates or occasionally carbonates – have a specific gravity of 2.5–3.5. High specific gravity is a diagnostic property of a mineral. A variation in chemistry (and consequently, mineral class) correlates to a change in specific gravity. Among more common minerals, oxides and sulfides tend to have a higher specific gravity as they include elements with higher atomic mass. A generalization is that minerals with metallic or adamantine lustre tend to have higher specific gravities than those having a non-metallic to dull lustre. For example, hematite, FeO, has a specific gravity of 5.26 while galena, PbS,