“…In addition to sulphides containing lead, zinc, copper and other metals, these basinal fluids precipitate large quantities of dolomite cement (Beales & Hardy, 1980) and are capable of dolomitizing lime-stones (Gregg, 1985;Machel & Mountjoy, 1987). Basinal fluids have affected carbonate rocks throughout much of North America, including major petroleum producing regions such as west Texas (Mazzullo, 1986;Kupecz & Land, 1991;Amthor & Friedman, 1992), the Appalachian Basin (Montafiez & Read, 1992), the Anadarko Basin (Gao & Land, 1991), the US Gulf Coast (Land & Prezbindowski, 1981;Woronick & Land, 1985), western Canada (Beales & Jackson, 1966;Mattes & Mountjoy, 1980;Walls & Burrowes, 1985;Qing & Mountjoy, 1989 and the Michigan Basin (Haefner et af., 1988). Petroleum commonly is associated with MVT deposits, sometimes creating problems during mining (e.g.…”