C-FCJE, a Bombardier DHC-8-102 aircraft operated by Central Mountain Air, was conducting flight GLR758 from Prince George, BC (CYXS) to Vancouver Intl, BC (CYVR). Approximately 24 nm North of Pemberton, BC (CYPS), the flight crew observed a Master Warning indication, and a number 1 engine Oil Pressure caution light.
The flight crew confirmed the low oil pressure with the analog gauge. The QRH was consulted and power was reduced on the number 1 engine (PWC PW121, S/N 121208). Shortly after the power reduction, the oil pressure dropped further. The flight crew subsequently shut the number 1 engine down as per company SOPs and QRH, and declared an emergency.
The aircraft landed at CYVR without further incident with ARFF standing by.
A post flight inspection revealed a substantial amount of oil on the lower portion of the number 1 engine.