Dragon's Kin by Anne McCaffrey

Beloved bestseller McCaffrey has joined forces with her son, Todd, to produce another delightful entry in the Pern series, which began with Dragonflight in 1968. The action here centers on Camp Natalon, the site of a coal mine. Now that the surface seams of coal have begun to run dry on Pern, it's imperative to start extracting coal from deep underground, despite the increased danger. Some of the miners rely on the expertise of the watch-whers, smaller versions of dragons, to help keep them safe in the mines.