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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 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.

EXAMPLEOBVERSEREVERSECOMMENTARYSAMPLE
SERIAL OR LOT
NUMBERS
ESTIMATED
MINTAGE
scarce-1troy-ounce-bunker-hill-co_1_deb1dc654ac3a382ee4df9c45772f86b scarce-1troy-ounce-bunker-hill-co_1_deb1dc654ac3a382ee4df9c457722f86b[THE BUNKER HILL COMPANY Custom Hallmark][.999 FINE]1oz ingot produced by The Bunker Hill Company.Absent<250
IMG_5249 IMG_5250[Serial Number] [THE BUNKER HILL COMPANY Custom Hallmark] [1.OZ] [FINE 999]Pressed Finish 1oz pressed bar produced by The Bunker Hill Company.34
37
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
648
684
726
727
728
729
730
771
861
911
994
1089
1100
<1,500
s-l1600-3 s-l1600-7 s-l1600-4 s-l1600-5[THE BUNKER HILL COMPANY Custom Hallmark] Cast FinishApproximate 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 Lot 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.
s-l1600-6
57   [2.15oz]
59   [2.20oz]
<250
50-oz-pour-bunker-hill-company-9995_1_ea2114944016e0fe8f19861192ab19a1[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 999 5]Cast Finish2.5oz class ingot produced by The Bunker Hill Company.  This variety is thinner and wider than our 2oz class variety, above.Absent<250
oz-poured-bunker-hill-company-999_1_736ed426a34f641794813488e698214d[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 999]Cast Finish4oz class ingot produced by The Bunker Hill Company.  A second known example weighs 5.10oz.  Absent<50
s-l1600-7s-l1600-8IMG_5251 IMG_5252[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 999 5]Cast FinishApproximate 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 a Lot Number.  Those that do include a Lot Number have it stamped on the foot of the ingot, as pictured below.
Screen Shot 2018-05-18 at 3.29.48 PM
2   [4.80oz]
7   [4.70oz]
42   [5.20oz]
62   [5.00oz]
86   [4.20oz]
<500
Screen Shot 2018-05-18 at 2.53.46 PM[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]Cast FinishApproximate 10oz class ingot produced by The Bunker Hill Company.  Observed in weight class ranging from 7.75oz to 12.40oz.  Note that some ingots, such as 11.50oz Lot #12 demonstrates the larger weight class font typically seen on the approximate 15oz weight class examples.  12.75oz ingot Lot #12 still retains the original purchase invoice, pictured below.
s-l1600Some known examples do not include a Lot Number.  Those that do include a Lot Nmber have it stamped on the foot of the ingot, as pictured below.
IMG_5241 copy
1   [10.55oz]
2   [12.20oz]
4   [10.30oz]
4   [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]
43   [11.05oz]
44   [8.45oz]
51   [11.50oz]
80   [8.75oz]
85   [7.75oz]
94   [9.90oz]
520   [10.10oz]
<750
Screen Shot 2018-05-18 at 2.53.46 PM[THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [FINE 999 5][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 Lot Number.  Those that do include a Lot Number have it stamped on the foot of the ingot, as pictured below.
IMG_5241
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
pour-bunker-hill-38-05-oz-bunker-hill_1_dd83a48a6c3f6adcdf5af517aa164109[Serial Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]Cast FinishUnique 38.05oz ingot produced by The Bunker Hill Company.122550<25
IMG_5255 IMG_5256[Serial Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]Cast FinishApproximate 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
IMG_5257IMG_5258[FINE 999] [NO. 5] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class] [PROSPECTOR ’75]Cast FinishApproximate 100oz class ingot produced by The Bunker Hill Company in unique ‘PROSPECTOR ’75’ variation.1   [106.55oz]
5   [96.45oz]
<10
IMG_5253 IMG_5254[Serial Number] [THE BUNKER HILL COMPANY Custom Hallmark] [Weight Class]Cast FinishApproximate 100oz class ingot produced by The Bunker Hill Company.  Observed in weight class ranging from 97.25oz to 101.10oz.  180   [98.90oz]
265   [97.25oz]
434   [100.20oz]

435   [100.50oz]
449   [100.20oz]
255   [97.25oz]

894   [101.10oz]
948   [100.65oz]

1303   [99.55oz]
<1,500