Your buckle has a strong resemblance to this modern pendant from Leonard Short Designs:
Leonard?s website provides this additional information:
This listing is for a very unique, hand-made pendant, designed for gold prospectors, relic hunters, metal detecting enthusiasts and history buffs in-general. The pendant is modeled from an actual California Gold Rush buckle that was lost by a forty-niner prospector in one of their gold mining camps during the Gold Rush era (1848-1855). I also know of at least one example of this style belt buckle that was recovered at a Civil War era Confederate States anthracite coal mine, so these obviously had appeal to miners of all types of minerals and were in use up through the Civil War. The original buckle was a dug relic, found with a metal detector in an actual gold mining camp. The model for this pendant was that actual two-piece gold rush miner's buckle just mentioned. I personally restored the buckle, which, although a very rare find, was damaged and needed professional restoration. These buckles are exceedingly rare and beautiful. They were designed specifically to capitalize on the gold mining frenzy and that common goal of folks traveling to the gold country to "strike it rich". The motif is a gold mining prospector with a shovel in one hand and a pick-axe on the ground beside the miner. His left hand is extended and I am assuming it is because he has a gold nugget in his outstretched hand. Also evident is the hilly gold country terrain, California vegetation, and centrally positioned 6-point star in the background sky.