Labrador Iron Mines

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Schefferville Area Projects

James
Redmond
Knob Lake
Houston & Malcolm
Sawyer Lake
Astray Lake
Kivivic No. 1 & 2
 
Location
Geology
Deposit Types
Mineral Resources & Reserve Estimates
Transportation & Infrastructure
Mining & Processing
Iron Ore Product & Markets

Sawyer Lake Deposit

The Sawyer Lake deposit is located approximately 65km southeast of the town of Schefferville and 1.6km northwest of Sawyer Lake. There is no existing road access except an abandoned drill access road, so accessibility is currently by air.

The overall iron content of the primary iron formation is 25% higher than the primary iron formations in other areas, the grade of the rich iron ores in general ranging from 65% to 70% with little variation from the top to the bottom of the lenses cut by drilling. Like the Astray Lake deposit 21km to the northeast, it is expected to produce a greater quantity of lump ore than the other soft ore deposits.

Exploration

On strike and beneath the Sawyer Lake iron deposit, extensive iron deposition has been discovered. One drill hole located 1,400 metres to the northeast was stopped in material grading 65.2% Fe. A gravity survey indicates a mass of high density rock southwest of Sawyer Lake. This gravity mass has not been explored.

LIM has observed that the deposit does not fit the two most common models for iron formation in the Labrador Trough and has several unique characteristics, the most prevalent of which is the exceptional grade both at depth and laterally, as well as a lack of silica, sulphur or magnetite, indicating that there was little mineralogical disturbance after deposition. There is no sign of Cretaceous weathering, even though the deposit occurs near the crest of a hill. It differs from the Knob Lake deposit in that the ore is very hard dense blue hematite with practically no goethite present.

Geology

The deposit occurs in iron formation in the south corner of the Petisikapau Synclinorium, a major structural feature of this part of the Labrador Trough. Localized in the Lower Sokoman Formation in the trough of a major north-plunging syncline, the general geological sequence of this deposit is high grade massive blue hematite ore on top of medium grade banded iron formation, which is over top of low grade banded iron formation where yellow ore begins to show up. Specular martite grains show up within the massive blue hematite zones. The banded iron formation is commonly composed of predominantly off-white chert (minor to moderate amounts of red and grey chert) banded with blue hematite.

Silica is replaced in many places with very little porosity or friability developed in the iron formation and the effects of oxidation are not conspicuous in either the iron formation or adjacent rocks.

Astray Deposit


 

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