The truck's driver is in serious condition and had to be airlifted to hospital.
B.C. Environment Ministry spokesman Rick Wagner says a tanker with an attached pup trailer overturned spilling about 30,000 litres of the chemical.
Wagner says the spill has been contained to a ditch and small area of the farmer's field.
He says no waterways have been affected.
The strength of the magnesium chloride solution was at 30 per cent and Wagner says it's not considered dangerous to humans. (CHNL)
The chemical is used to control dust on roads and isn't considered dangerous to human health. Brief.