The Porcupine Warriors went into matchday 28 trailing Hearts by two points but their latest victory sees them move a point above the Phobians, albeit temporarily.
Kotoko made a poor start to the game but upped the ante and began creating a couple of chances as the match wore on.
Mariano Barreto’s side got their reward in the 23rd minute when Patrick Asmah’s precise cross was met by a towering header from Gama.
The Brazilian import was left unmarked in the Ashanti Gold box and he made no mistake, as he planted his header into the back of the net.
Despite an improved performance from the Miners in the second half, Kotoko held on for a very important victory.
The Porcupines are currently a point above bitter rivals Hearts, but the Phobians could reclaim top spot if they beat city rivals Great Olympics in the Mantse Derby later tonight.