ALL ENGELHARD is pleased to welcome visitors to our Bunker Hill Company Definitive Page. While our focus is clearly Engelhard, we recognize that many Engelhard bullion collectors also collect other bars and ingots. As such, we appreciate the opportunity to present additional collections and look forward to your thoughts and input!
The Bunker Hill Company is located in the silver rich district of Kellogg, Idaho and was a subsidiary of Gulf Resources and Chemical Corporation. They operated as one of the largest mining and smelting complexes in the world, producing 20 percent of America’s primary refined lead and zinc. They also operated the most modern electrolytic silver refinery, producing approximately 10 million ounces of 999.5+ fine silver and 12,000 ounces of refined gold annually. An inquiry to the Idaho Mining Association in Boise, Idaho on May 17, 1971 by one of our core collectors revealed the Bunker Hill Company was the only mining operation with the capacity to mine, smelt and refine ore from this rich district. Subsequent inquiries to the Bunker Hill Company yielded a 9.85oz ingot and included a written response from Bunker Hill Company. The correspondence explained that these ingots were normally only available to dignitaries and/or organizations wishing to raffle an example. Over the years, with the perseverance of a few advanced collectors and contacts established, more ingot examples were acquired in the collector community. Bunker Hill Company produced an assortment of varied weight poured serial numbered silver ingots from the early 1960’s to early 1970’s. Note that there was no formal production line and thus, no two ingots are the same. Imagine that! Bunker Hill also produced pressed odd-weight bars and 1oz rounds from the early 1970’s through 1981. It is important to note that many of the ingots produced by Bunker Hill Company carry duplicate assignment numbers, which we believe are actually ‘LOT’ numbers, and not unique individual serial number assignments, as commonly observed on examples from other well recognized refiners. These ingots and bars are seldom seen today, and are all considered scarce, commanding immediate attention from collectors.
Our Definitive Page entries for Bunker Hill Company ingots are assembled in approximate weight class groupings with associated serial numbers. Please note that this is currently an exhaustive list of known serial numbers and represents our current serial number registry for this refiner. We welcome any photos and serial numbers of ingots not represented below, or findings to supplement our information.