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Location: 11 km W from Lanigan, Saskatchewan, Canada
Box 3100LaniganSaskatchewan, CanadaS0K 2M0
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Much of southern Saskatchewan is underlain by the Prairie Evaporite Formation, a layered sequence of salts and anhydrite which contains one of the world’s largest deposits of potash.The 100 m to 200 m thick Prairie Evaporite Formation is overlain by between 400 and 500 m of Devonian carbonates, followed by approximately 100 m of Cretaceous sandstone, and between 400 and 500 m of Cretaceous shales and more recent Pleistocene glacial tills to surface. The Prairie Evaporite Formation is underlain by Devonian carbonates. The Phanerozoic stratigraphy of Saskatchewan is remarkable in that units are flat-lying and relatively undisturbed over very large areas.Potash mineralization in this region of Saskatchewan is predominantly sylvinite, which is comprised mainly of the minerals sylvite (KCl) and halite or rock salt (NaCl), with trace carnallite (KMgCl3 · 6H2O) and minor water insolubles. Potash fertilizer is concentrated, nearly pure KCl (i.e. greater than 95% pure KCl), but ore grade is traditionally reported on a % K2O equivalent basis. The “% K2O equivalent” gives a standard measurement of the nutrient value of different potassium-bearing rocks and minerals. To convert from % K2O equivalent tonnes to actual KCl tonnes, multiply by 1.58.Deposit TypeThere are three mineable potash members within the Prairie Evaporite Formation of Saskatchewan. Stratigraphically highest to lowest, these members are: Patience Lake, Belle Plaine, and Esterhazy.The Lanigan potash deposit lies within the Patience Lake Member of Prairie Evaporite Formation. There are two potash seams named A Zone and B Zone within this member; both the A Zone and B Zone are being mined at Lanigan. Two other potash members are present at Lanigan: the Belle Plaine Member and the lesser developed Esterhazy Member. Lanigan potash mineralization occurs at an average of about 990 m depth below surface. Salt cover from the top of the A Zone mining horizon to overlying units is approximately 7 m thick, and salt cover from the top of the B Zone mining horizon to overlying units is approximately 14 m thick.
