Carbonate-hosted lead-zinc ore deposits and pyrite thus form. Commonly MVT deposits form by the combination of hydrocarbon pyrolysis liberating zinc-lead ions and sulfur to form an acidic solution which dissolves the host carbonate formation and replaces it with massive sulfide accumulations. This may also take the morphology of fault-hosted stockworks, massive tabular replacements and so forth. Porous limestones may form disseminated ores, however most MVT deposits are massive sulfides with knife-like margins between carbonate and sulfide mineralogies. Ore minerals in carbonate replacement deposits are typically lead sulfide, galena, and zinc sulfide sphalerite. Weathered equivalents form anglesite, cerussite, smithsonite, hydrozincite and secondary galena and sphalerite
Galena, Alaska The City of Galena is incorporated as a first-class city, governed by a city council. The city's mayor is Jon Korta. The Louden Tribal Council is elected to represent the local Athabascan Native community. The council's tribal chief is Jenny Pelkola. The City of Galena operated a full-time police department. There is an Alaska State Troopers post in Galena with two troopers and a trooper-pilot. Galena has a volunteer Rescue Squad composed of Alaska Emergency Trauma Technicians (ETT) and Emergency Medical Technicians (EMT), and a volunteer fire department which recently received new advanced firefighting apparatus from the U.S. Air Force