This document presents the results of a laboratory investigation that examined the compressive strength of coal samples collected from the field. Coal samples were subjected to impact loading using a Protodyakonov strength index test apparatus. This involved dropping a hammer onto coal samples from a height of 600 mm a varying number of blows from 5 to 25. The crushed coal was measured to calculate the Protodyakonov strength index (PSI), which was then used to determine the compressive strength of each coal sample. The results found that coal samples had a maximum compressive strength of 0.24 MPa after 25 blows and a minimum of 0.12 MPa after 5 blows. Thus, the number of blows impacted the measured