BUNKER HILL COMPANY

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 and 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 number assignments, as commonly observed on examples from other well recognized refiners. We will henceforth refer to these numbers as assignment numbers for the entirety of our Bunker Hill Definitive Page. 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 assignment numbers. Please note that this is currently an exhaustive list of known assignment numbers and represents our current assignment number registry for this refiner. We welcome any photos and assignment numbers of ingots not represented below, or findings to supplement our information.

EXAMPLE	OBVERSE	REVERSE	COMMENTARY	SAMPLE ASSIGNMENT NUMBERS	ESTIMATED MINTAGE
	[MULTIPLE HISTORICAL IMAGES]	[THE BUNKER HILL COMPANY] [KELLOGG, IDAHO] [1981 or 1982] [BUNKER HILL SILVER LOGO] [ONE TROY OUNCE] [999.5 FINE] [GULF RESOURCES & CHEMICAL CORPORATION LOGO] [A SUBSIDIARY OF GULF RESOURCES & CHEMICAL CORPORATION]	This series of silver medallions was minted in 1982 by The Metal Arts Company of Rochester, New York from silver produced at the Bunker Hill refinery of Kellogg, Idaho. Mintage was reportedly limited to approximately 30,000 sets, though we believe far fewer were actually produced.	N/A	<30,000
	[THE BUNKER HILL COMPANY Custom Hallmark]	[.999 FINE]	1oz ingot produced by The Bunker Hill Company.	Absent	<250
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [1.OZ] [FINE 999]	Pressed Finish	1oz pressed bar produced by The Bunker Hill Company. Ingot #232 sold on MinEx auction on January 14, 2024 for $837.	34 37 44 73 74 75 76 78 79 155 156 158 159 160 162 164 197 284 285 293 294 295 296 307 427 441 442 443 444 445 493 494 568 612 648 684 726 727 728 729 730 771 861 911 994 1089 1100	<1,500
	[THE BUNKER HILL COMPANY Custom Hallmark]	Cast Finish	Approximate 2oz class ingot produced by The Bunker Hill Company. This variety demonstrates the ingot’s weight class and purity along the leading edges, as well as the assignment number on the foot of the ingot, as pictured below. Please note that the reverse engraving on this ingot is believed to have been applied after production and is not representative of ingots produced by The Bunker Hill Company.	57 [2.15oz] 59 [2.20oz] 69 [2.40oz] 75 [2.55oz]	<250
	[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995]	Cast Finish	Odd weightclass ingot produced by The Bunker Hill Company. This variety is thinner and wider than our 2oz class variety, above.	Absent	<250
	[THE BUNKER HILL COMPANY Custom Hallmark] [FINE] [999]	[Custom Engraving] [IN RECOGNITION OF 5 YEARS NO DISABLING INJURY] [R. TARGETT] [BUNKER HILL MINE GRAVEYARD REPAIR CREW]	Odd weight class ingot produced by The Bunker Hill Company as an employee recognition award.	Absent	<25
	[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 999]	Cast Finish	4oz class ingot produced by The Bunker Hill Company. A second known example weighs 5.10oz.	Absent	<50
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [999 FINE]	Cast Finish	Odd weight class ingot produced by The Bunker Hill Company.	14 17	<25
	[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995]	Cast Finish	Approximate 5oz class ingot produced by The Bunker Hill Company. Observed in weight class ranging from 4.20oz to 5.60oz. Some known examples do not include an assignment number. Those that do include a assignment number have one stamped on the foot of the ingot typically, as pictured below.	2 [4.80oz] 7 [4.70oz] 21 [4.95oz] 42 [5.20oz] 62 [5.00oz] 86 [4.20oz]	<500
	[Serial Number] [Weight Class] [THE BUNKER HILL COMPANY Custom Hallmark] [FINE 9995]	Cast Finish	Approximate 5oz class ingot produced by The Bunker Hill Company.	1368	<100
	[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]	Cast Finish	Approximate 10oz class ingot produced by The Bunker Hill Company. Observed in weight class ranging from 7.75oz to 12.40oz. Note that some ingots lack a purity stamping on the obverse, and others such as 11.50oz #12, demonstrates the larger weight class font typically seen on the approximate 15oz weight class examples. 12.75oz ingot #12 still retains the original purchase invoice, pictured below. Some known examples do not include an assignment number. Those that do include one have it stamped on the foot of the ingot, as pictured below. Note that at least one example, 71, is of a unique casting shape as demonstrated in the photo below. 10.70oz ingot #17 is stamped on the right leading edge as shown below.	1 [10.55oz] 2 [12.20oz] 4 [10.30oz] 4 [12.95oz] 6 [12.95oz] 7 [11.50oz] 7 [12.40oz] 9 [9.50oz] 10 [11.93oz] 11 [11.55oz] 12 [10.10oz] 12 [12.75oz] 15 [12.30oz] 17 [10.70oz] 20 [10.55oz] 36 [12.80oz] 38 [10.60oz] 43 [11.05oz] 44 [8.45oz] 51 [11.50oz] 79 [10.95oz] 80 [8.75oz] 85 [7.75oz] 94 [9.90oz] 95 [9.80oz] 520 [10.10oz]	<750
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995]	Cast Finish	Approximate 10oz class ingot produced by The Bunker Hill Company.	71 [12.15oz]	<25
	[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]	[999 FINE]	Approximate 15oz class ingot produced by The Bunker Hill Company. Observed in weight class ranging from 13.45oz to 17.85oz. Some known examples do not include a assignment number. Those that do include a number have it stamped on the foot of the ingot, as pictured below.	3 [14.70oz] 7 [14.55oz] 8 [14.45oz] 11 [15.35oz] 14 [13.45oz] 15 [13.50oz] 18 [13.50oz] 20 [16.20oz] 21 [14.90oz] 30 [14.15oz] 31 [14.45oz] 34 [16.95oz] 35 [15.95oz] 35 [17.35oz] 36 [15.07oz] 39 [14.57oz] 46 [13.60oz] 49 [16.50oz] 54 [16.50oz] 56 [17.75oz] 74 [16.50oz] 74 [17.60oz] 77 [15.85oz] 78 [15.20oz] 79 [17.85oz]	<250
	[The Bunker Hill Company] [99.9% Silver] [25 tr. oz.]	[Northwestern Mining Association] [76th Convention] [1970]	25oz ingot produced by Bunker Hill Mining in 1970 for the 76th Northwestern Mining Association Convention.	N/A	<25
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995+]	Cast Finish	Approximate 25-30oz class ingot produced by The Bunker Hill Company. Ingots of this low assignment range are believed to have been examples acquired by employee of The Bunker Hill Company.	3 [25.35oz] 4 [25.25oz] 10 [32.00oz] 11 [30.20oz]	<10
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995]	Cast Finish	Approximate 30oz class ingot produced by The Bunker Hill Company. Ingots of this low assignment range are believed to have been examples acquired by employee of The Bunker Hill Company.	36 37	<25
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995]	Cast Finish	Approximate 40oz class ingot produced by The Bunker Hill Company.	122550	<50
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 9995]	Cast Finish	Approximate 50oz class ingot produced by The Bunker Hill Company. Observed in weight class ranging from 48.75oz to 50.55oz.	4 [49.35oz] 23 [49.40oz] 24 [48.75oz] 347 [49.75oz] 376 [49.90oz] 642 [50.55oz] 1035 [50.00oz] 1274 [50.50oz]	<1,500
	[FINE 999] [NO. 5] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [PROSPECTOR ’75]	Cast Finish	Approximate 100oz class ingot produced by The Bunker Hill Company in unique ‘PROSPECTOR ’75’ variation.	1 [106.55oz] 5 [96.45oz]	<10
	[Assignment Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]	Cast Finish	Approximate 100oz class ingot produced by The Bunker Hill Company. Observed in weight class ranging from 97.25oz to 101.10oz.	180 [98.90oz] 255 [97.25oz] 265 [97.25oz] 434 [100.20oz] 435 [100.50oz] 449 [100.20oz] 458 [100.05oz] 471 [98.50oz] 472 [98.75oz] 623 [100.70oz] 624 [99.85oz] 625 [100.35oz] 674 [99.70oz] 894 [101.10oz] 948 [100.65oz] 1303 [99.55oz]	<500