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Bolands Mine
in Färnebo Parish, Wermlands County
The mine is located on Yngshytte hemmans land, next to the road to Filipstad, approximately 1 km from the Persberg Odal field. The general bedrock consists of Hälleflintgneiss (eurite), part of the same geological area as the other mines on the field.
Ore Deposit and Shafts
The ore layer runs in a north–south direction. At the first shafts from the surface, at about 11 meters depth, it appeared only as a narrow vein.
Along the mine, the ore layer increased in size:
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At 26 meters depth, the layer is 22 meters long between supports and 5.5 meters wide.
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At 32 meters depth, the width increases to 10.5 meters.
At this depth, a skarn fracture intersected the ore layer, splitting it into two parts.
The ore consists of hematite, which in cupellation tests yields 54.5 % pig iron, with 0.01 % phosphorus and a small amount of sulfur.
Filipstad, February 1889
P. Öberg
Machinery Modernization in 1897
In 1897, ironworks owner E. J. Jansson, Hannickehammar, replaced the horse-powered winch at Bolands Mine with a locomobile. However, it was of an older type and more fuel-consuming than newer models, such as those delivered by Munktell Workshop.
At the same time, 7 pump sets were installed in the mine. According to the mine map, the depth was about 80 meters.
Costs
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Ore hoisting per ton from 7 levels:
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Horse winch: 90.6 öre/ton
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Locomobile: 88.9 öre/ton
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Hoist and waterwheel did not operate simultaneously:
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Hoist: 284 hours/month
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Waterwheel: 182 hours/month
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Fuel cost: approx. 150 SEK
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”As can be seen above, the cost per ton of ore was almost identical in both cases, although this is partly due to the more intensive mining that occurred later, made possible by the use of steam power.”
Source:
Wermländska Bergsmannaföreningens Annaler, 1898
