The ABM deposit is a bimodal-felsic, replacement-style volcanogenic massive sulfide deposit (VMS) that is hosted by back-arc affinity rocks of the Yukon–Tanana terrane in the Finlayson Lake VMS district, Yukon, Canada. Massive sulfide zones occur as stacked and stratabound lenses subparallel to the volcanic stratigraphy, surrounded by pervasive white mica and/or chlorite alteration. Remnant clasts of volcanic rocks and preserved bedding occur locally within the massive sulfide lenses and indicate that mineralization formed through subseafloor replacement of pre-existing strata. Three mineral assemblages occur at the ABM deposit: (1) a pyrite–chalcopyrite–magnetite–pyrrhotite assemblage that is associated with Cu–Bi–Se–Co-enrichment and occurs at the center of the massive sulfide lenses; (2) a pyrite–sphalerite assemblage, which occurs more commonly towards lens margins and is enriched in Zn–Pb–Ag–Au–Hg–As–Sb–Ba; and (3) a minor assemblage comprising chalcopyrite–pyrrhotite–pyrite stringers associated with pervasive chlorite alteration, which occurs mostly at the sulfide lens margins. Petrographic observations of preserved primary, zone refining, and metamorphic textures in combination with in situ geochemistry show that the pyrite–sphalerite assemblage formed at lower temperatures (< 270 °C) than the other two mineral assemblages (~ 270–350 °C), and that mineral chemistry in all mineral assemblages was affected by greenschist facies metamorphism, although the effects are limited to recrystallization, small-scale remobilization (< 1 m) and trace element redistribution.

ABM 矿床是一种双峰长英质、接替型火山成因块状硫化物矿床 (VMS)，由加拿大育空地区 Finlayson 湖 VMS 区育空-塔纳纳地体的弧后亲和岩赋存。大量的硫化物带以与火山地层近平行的堆叠和层状透镜体的形式出现，周围环绕着普遍的白色云母和/或绿泥石蚀变。火山岩的残余碎屑和保存下来的层理局部出现在块状硫化物透镜体内，表明矿化是通过海底替换先前存在的地层而形成的。ABM 矿床中存在三种矿物组合：(1) 黄铁矿-黄铜矿-磁铁矿-磁黄铁矿组合，与 Cu-Bi-Se-Co 富集有关，出现在块状硫化物透镜体的中心；(2) 黄铁矿-闪锌矿组合，更常见于晶状体边缘，富含 Zn-Pb-Ag-Au-Hg-As-Sb-Ba；(3) 一个由黄铜矿-磁黄铁矿-黄铁矿串组成的小组合，与普遍的绿泥石蚀变有关，主要发生在硫化物透镜体边缘。对保存的原生、区域细化和变质结构的岩相观察与原位地球化学相结合表明，黄铁矿-闪锌矿组合形成的温度（< 270 °C）低于其他两种矿物组合（~ 270-350 °C），所有矿物组合中的矿物化学都受到绿片岩相变质作用的影响，尽管这种影响仅限于重结晶、小规模再活化（< 1 m）和微量元素重新分布。