The Mining Beam is a special weapon of the game Star Trek: Armada. It is actually not a weapon in the conventional sense. It's the means with which freighters of the game mine the dilithium from the corresponding moons. It is automatically used, when sending a freighter to a mining station or dilithium moon. It looks like this:

The increased firing rate caused by a Death Chant also affects the Mining Beam, increasing the output rate by 50%. When having less than 3 freighters at a Dilithium Moon, this may boost income rate. If you already have 3 or more freighters at one moon, there is little point in using this method, as the processing speed of mining stations is not increased, making them the bottle neck.