Hydromagnesite is reported to occur in the area of 141 Mile House along the Cariboo Road. White and cream colored hydromagnesite is deposited in an area over 30 metres across and down- slope from a mineral spring near 141 Mile House and east of the railway tracks. The material contains freshwater shells and is predominantly calcium carbonate with magnesian carbonate and a small amount of alkalic carbonate. The material is earthy and granulated, similar to the impure hydromagnesite underlying the larger hydromagnesite deposits in central and northern British Columbia. Sample A was collected about 6 metres downstream from the spring and Sample B was collected about 30 metres downstream (all values are in per cent):

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Sample A - 12.14 MgO; 34.31 CaO; 1.32 FeO; 3.58 Fe2O3; 8.78 SiO2;0.10

Na2O; 0.58 K2O; Tr SO3; 36.84 CO2; 3.1 H2O; Nil LOI.

Sample B - 5.00 MgO; 43.32 CaO; 0.73 FeO; 0.64 Fe2O3; 5.22 SiO2; 0.02

Na2O; 0.36 K2O; Tr SO3; 35.10 CO2; 6.06 H2O; 4.01 LOI.

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