PA Mining Law - Section 273 (2) Practice test questions for the PA Mine Officials' Exam Progress Indicator: Question 1 of 14 1.  _____________ shall be provided at each permanent oil station located underground. Choices: A portable fire extinguisher and 240 lbs. of rock dust 2 portable fire extinguishers 2 portable fire extinguishers and 240 lbs. of rock dust 240 lbs. of rock dust