Each of salt treated and untreated mining timber (wedge) pairs with 5x15 cm² cross-section and 155 cm length prepared from Scots pine, Bornmüller's fir and oriental beech was cut in the small standard test specimens to determine changes in some important mechanical and physical properties, 13 month after exposure to the conditions of Kozlu Hard Coal Mines in the depth of 52 m. Thus, the method for determining the effects of decay on structural timber in service were described. Losses in impact bending, static bending and modulus of elasticity, and specific gravity were calculated as a percentage of the values for controls. Furthermore, relations between residual strength values and losses in specific gravity were statistically evaluated. Decreases in impact bending strength of all controls were ranged from 70% to 88%, in static bending strength from 71% to 73%, in modulus of elasticity from 50% to 56% while losses in specific gravity were ranged from 9% to 11%. The strength losses of wedge blocks treated with CCB salts were found between 3% and 6%, and changes in specific gravity were lower than 1%. Brown and white rot decay were determined on softwood and hardwood samples respectively.

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