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the mining practice in swedish mines.
257
The underhand stoping method was down to 1858 the only method of
mining employed in Swedish ore mines; in that year takbrytning med
igensättning (overhead stoping with filling) was introduced in the
Åmmeberg zinc mines, but it was not till 1869 that the method began to be
employed in a Swedish iron mine, notably at Dalkarlsberg, after which the
method was gradually introduced into quite a number of mines, both in
Central Sweden and in the Gällivare Malmberg in Norrbotten. About
1900 a new mining method was introduced, namely magasineringsbrytning,
(shrinkage stoping) that is overhead stoping without filling, in which a
considerable part of the ore broken is allowed to remain until the working
room has been excavated. This method, which was first adapted at Grän-
Ore Bins, Dalkarlsberg.
gesberg and Striberg, has gradually’ obtained a very general application,
and in many places has replaced the overhead stoping with filling process
or the underhand stoping method. The crosscut slicing with filling
(tvärbrytning med igensättning) has been employed since the seventies in a
number of mines with loose or readily crumbling ore; in the last ten years,
however, the methods employed in mines of this kind have been the
sub-drift of caving system (rasbrytning) specially the top slice system.
In the Swedish coal mines is as a rule used a combination of pillar and
stoll working and longwall system.
The shafts in Swedish mines are either perpendicular, which is usually
the rule, or inclined following the dip of the ore body.
11—133179. Sweden. II.
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