Vintage cowboy spec cast Belt buckle

heavy belt buckle with cowboy panning gold on it. very heavy. not sure what material is. 1979 made in Denver silver brass gold color has a couple worn areas Western, southwestern, southern, ranch, prairie, country, Aztec, geometric, tribal, concho, serape, cowgirl, rodeo, wrangler, cowboy, rancher, farm girl, farmer, barn, fringe, tassels, equestrian, riding gear, jodhpurs, breeches, horse show, horse girl, English, muck, paddock, line dancing, square dancing, chore, rural,