- SMDI #
- 2541
- Current Showing Name
- Egg Lake Gypsum Deposit or drill hole 3-76
- Historical Showing Names
- Egg Lake Gypsum Deposit or drill hole 3-76
- Company Name
- Project Name
- UTM Easting (NAD83 Z13)
- 465175.2500
- UTM Northing (NAD83 Z13)
- 6083736.4200
- NTS Sheet
- 073I13
- TRM (Township-Range-Meridian)
- 68-24-2
- Primary Commodities
- Gypsum
- Associated Commodities
- Discovery Type
- Drillhole
- Status
- Occurrence: Primary Exploration
- Geological Details
- The Egg Lake Gypsum Deposit or Saskatchewan Department of Mineral Resources drill hole La Ronge 3-76 is located at Legal subdivision 3 Section 25 Township 68 Range 24 west of the 2nd meridian. The showing is located approximately 9.97 km (6.2 miles) south of the south tip of Groop Bay on Egg Lake and 43.85 km (27.25 miles) north of the town of Molanosa.
Drill hole 3-76 encountered the following geology:
DEPTH GEOLOGICAL LITHOLOGIES
(M) FORMATION ENCOUNTERED
____________________________________________________________________________
0.0 - 56.1 glacial drift
56.1 - 95.1 Mannville Formation Cretaceous shales and sands
95.1 - 117.0 Upper Meadow Lake Fm. Middle Devonian Winnipegosis dolomite
117.0 - 159.1 Lower Meadow Lake Fm. Lower Devonian dolomite and gypsum
131.4 - 137.0 Lower Meadow Lake Fm. 75% dolomite, 25% gypsum - small veins
137.0 - 139.3 Lower Meadow Lake Fm. 15% dolomite, 85% gypsum - single vein
139.3 - 149.8 Lower Meadow Lake Fm. 75% dolomite, 25% gypsum - small veins
149.8 - 159.1 Lower Meadow Lake Fm. 80% dolomite, 20% gypsum - small veins
159.1 - 163.4 Lower Winnipegosis basal sandstone
163.4 Precambrian
Between 137.0 m and 139.3 m (449.5 and 456.0 ft), the drill hole intersected a bed of gypsum in the sequence of Meadow Lake Formation dolomites and minor interlayered gypsum. The deposit also contains 16.15 m (53.0 ft) of lower grade dolomite containing veins and bands of gypsum which encloses the main vein. Analyses of the ore indicates the ore would be suitable for the commercial gypsum market. The levels of impurities, especially magnesium oxide and calcium carbonate, are high.
DRILL SAMPLE PCT PCT PCT PCT PCT PCT PCT TOTAL
METREAGE NUMBER SiO2 Fe2O3 CaO MgO CO2 H2O SO3 PCT
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132.4 1-3 1.3 0.05 35.0 1.17 2.90 21.1 39.3 100.8
138.0 2-3 8.8 0.10 29.2 1.40 3.94 19.4 38.0 100.8
138.8 3-3 0.9 0.07 32.2 3.62 7.74 20.0 36.3 100.8
149.0 4-3 5.0 0.03 32.5 0.12 1.16 19.1 42.6 100.5
It is estimated that 50% of the gypsum could be recovered by mining. The It is estimated that 50% of the gypsum present could be recovered by mining. The recoverable gypsum is estimated to be 2.64 tonnes per square metre or 24,400 tonnes per hectare. Kilborn estimated that a deposit covering 205 hectares would be required for a mine to operate profitably for a 20 year period. In spite of the difficult impurities, the deposit appears economic to mine underground using convential room and pillar methods. The extremely high cost of transportation of crude gypsum to any market dictates that the mine could not be profitable.
- Geological Domain
- Glennie
- Host Rocks
- Host Minerals
- Indicators
- Exploration History
- 7/22/1993 Between 1976 and 1977, the Saskatchewan Department of Mineral Resources, under the DREE-Provincial Industrial Minerals Evaluation Plan, completed a series of rotary drill holes between La Ronge and La Loche to evaluate the sedimentary geology at the shield edge. All holes were gamma ray induction logged. Drill hole 3-76, which was completed in May of 1976, encountered the gypsum mineralization which constitutes this showing or the La Ronge-Egg Lake Gypsum Deposit. No further drill holes were completed to further delineate the mineralization. At this point, Kilborn Saskatchewan Ltd calculated a preliminary deposit reserve.
In 1978, the Saskatchewan Department of Mineral Resources contracted Kilborn (Saskatchewan) Ltd. to do a feasibility study of the La Ronge-Egg Lake Gypsum Deposit. This study concluded that the deposit was sub-economic.
In 1993, Pine Channel Gold flew an airborne magnetic survey which covered the showing (AF 73I-0003).
- Production History
- Reserves and/or Resources
- 1976-01-01
5.27 tonnes of in-situ gypsum for every square meter of gypsum bed. Estimated 50% recovery rate or 2.64 tonnes gypsum per square meter.
Summary:
Historic reserve (unspecified)
- Gypsum @ 50 %