Document LQkYRjkZ1MzkELEz7aYrB4oQ

< 1933, but It was not until 1944 that significant production started, ' 1956, the year of the final closing of the nines, 136,000 tonnes of ocldollte hod been shipped. Rlnety-eight percent of this fiber cent on two Bines In the Wlttenoon Corge (Fig. 6), the Colonial Mine and te Wlttenoon Mine. Here mining was entirely within the Doles Corge jmber of the Brockman Iron Formation (Trendall and Blockley, 1970). slebe of oceanic or continental mantle material, which during the mountain building episode broVe up Into smaller volumes of roch and were injected upwards Into overlying rocks of the Karelldlc schist belt. The Karellde metasediment s are thought to range lp^age from %2200 to s.2000 m.y. (Slmonen, 1980). Late Karelian granites (*vl900 m.y.) were Injected into the schist belt rocks, and where they make contact with the serpentinized perlotltes, commercial quality anthophylllte asbestos is developed --at Faakklla, located on the northern shore of Lake JuojBrvl, East Save, end at Maljasalml, 10 km to the southeast. The main asbestos producing area at Faakklla is comprised of blotlte gneiss vlth numerous pods or lenses of ultramafle rock cut by Haarlanvaava granite (Fig. 5). These pods typically contain relict oilvine surrounded by serpentine aggregates and bundles of anthophylllte needles. Cotmsonly the anthophylllte needles penetrate polklloblastleally the relict olivine (Vllk, 1953). Tale sometimes has replaced anthophylllte and olivine; there is not much serpentlnlzatlon (Haspsla,. PRODUCED BY FORD Anthophylllte In Alpine-type ultrswaflc rocks of East Finland In the Karelian Mountains of East Finland there occur a number of ultraTMfie bodies In the form of pods or lenses which were originally dunlte or enstatlte-bcarlng peridotltes. These alplne-tjrpe serpentlnleed ultramafle masses are thought to have been once a part of much larger 292 The country rocks In the Maljasalml area, the secondary anthophyll!' asbestos producing locality, are Karelian mica schist cut by granite peg matite dikes. The serpentlnlxed peridotltes within the schists are 293