Intrusion-related gold systems (IRGS) are a newly-defined (1999) deposit classification (based mainly on well-studied deposits in Alaska and Yukon) that is already mired in confusion, nomenclature uncertainty and misapplication. Increasingly, gold deposits are mis-assigned an IRGS classification because: 1) the nomenclature of intrusion-related gold models has been rapidly evolving; 2) the characteristics of the classification are broadly defined to include a wide range of deposit types that overlap with other gold deposit types; and 3) granitoid intrusions are common features of orogenic belts and are an obvious fluid source for any proximal gold occurrence. 

Reduced intrusion-related gold deposits have become a new, low-grade, large-tonnage exploration target during the last decade. The best recognized examples of such deposits are recognized throughout the Tintina Gold Province of the northern North American Cordillera. Because such examples may have many features in common with orogenic gold deposits, such as anomalous Bi, W, and Te,

Месторождения золота, локализующиеся в метаморфических толщах, на западе классифицируемые как «орогенный»1 и связанный с восстановленной интрузией («Reduced Intrusion-related Gold Systems», далее – RIRGS2) типы, играют ведущую роль в экономическом отношении, на них приходится более 40 % добычи золота в мире, за исключением россыпей и месторождения Витватерсранд (ЮАР) [Бортников и др., 2016; Чугаев, 2024; Frimmel, 2008; Phillips, 2013; Lipson, 2014; Goldfarb et.al., 2014]. Изучение генезиса руд является важным не только в понимании процессов образования месторождений, но и в выборе стратегии поисковых и геолого-разведочных работ.