Thursday, March 26, 2009
Brynnor Mine is Redford Property
Redford Property British Columbia, Canada • High Grade Iron Deposit • 100%-owned • 25 claims covering 10,800 hectares (26,687 acres)
"good business to be in"
Paul Caghill, of Anglo American, told Reuters. "the iron ore market ... long term we think it is a good business to be in, ..." 24 Mar 2009
Wednesday, March 25, 2009
Brynnor Mine ...Geological Summary
Brynnor Mine
The Brynnor Iron mine occurs in the center of the Redford property in the floor of Draw Creek valley (Figure 5). Noranda produced 3,011,306,260 kilograms of iron concentrate at a concentrate grade of 63.8% iron from 4.48 million tonnes of magnetite ore mined from 1962 – 1968 (James, 1968). A deeper magnetite deposit was developed for production, but was never mined. A mill and deep water shipping dock was located on Toquart Bay.
The Brynnor ore is fine grained, massive magnetite and magnetite-bearing skarn in Triassic Quatsino Formation marble and overlying tuff and argillite of the Jurassic Bonanza or Parsons Bay Formations. Seven lenses and bands of magnetite and skarn are reported in marble contacts. The marble – sediment contact and magnetite deposits take the form of a NNE-trending flat, plunging anticline with steep limbs. The Brynnor ore bodies lie near the SSW end of the anticline. The rocks and the deposits are in a roof pendent 1 km wide and 3.5 km long engulfed by granitoid intrusives (Sangster, 1969).
The strata are intruded by bodies and dykes of amygdaloidal to porphyritic andesite to diorite. The mine strata and intrusive andesite – diorite are surrounded and intruded by multiphase granitoid intrusives described as diorite, quartz diorite and granodiorite. In the open pit, feldspar porphyry and leucodiorite dykes up to 10 meters wide cut the magnetite and show chilled contacts against skarn. Neither skarn nor magnetite is developed in them (Sangster, 1969). Quartz monzonite occurs locally in the area of the mine and two such dykes cut the deposit.
Alteration in the marbles, tuffs and sediments includes skarn composed principally of garnet and epidote and prehnite alteration affected various intrusive rocks. The pre-ore andesite-diorite is partly altered to magnetite, skarn, serpentinites, epidote, prehnite and pyrrhotite (Sangster, 1969).
Only minor pyrite or pyrrhotite occurs in the mine. Small pockets of chalcopyrite were encountered locally in both andesite and skarn. Trace arsenopyrite was also noted.
Brittle faults of various attitudes marked by gouge and breccia cut the deposit. The most significant fault offsets the underground deposit and down-throws the southeast block by 60 meters.
Some quartz veins in the northwest pit wall contain gold in the tenths of an ounce (Walker, 1997).
Monday, March 23, 2009
Brynnor Mines Open Pit
Current photo of Brynnor Mine's Open Pit. Note good road access. 12 km (7.5 miles) to deep water ocean port site
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