P PT. Agincourt Resources (PT. AR) Gold Mine located in North Sumatra, SouthTapanuli has 2 pits that currently in production, namely Purnama pit & Barani pit.In the mining production process, blasting is needed to provide crushed rock masscause of the explotion so that rocks rich in mineral can be excavated and loaded to beprocessed or the waste rock is discharged to disposal. The blasting process producesenergy that is used to provide rock mass but the blasting results produce residualenergy as well. Blasting vibration is one of the residual energy results from blasting.Therefore, measurements of ground vibration with the Blastmate III device are usedto determine the equation for determining the vibration, namely peak particlevelocity (PPV) for the PT. AR gold mine. Loacted near from Purnama pit there is aprocessing plant that is used as a smelting and refining the distance is within ± 50 mfrom the Purnama pit. In the Barani pit the nearest residential area which is about ±1200m. This is the basis of measurement to make predictions of the groundvibrations grouped in front of the freeface and behind the freeface. Vibrationanalysis uses a scaled distance formula which is the ratio of distance to the root ofthe half of the amount of explosives. The result from the power regresion formeasurement behind the freeface produce the equationwhile the measurement from in front of the freeface produce the equation of. For the sound preasure level the regretion alnalysisproduce .