Caves of Ice by Sandy Mitchell

On the ice world of Simia Orichalcae a spate of mysterious disappearances is causing unrest amongst the mine-workers, and, as senior officer, Cain is nominated to investigate. Unbeknownst to him, the planet is right in the path of a major ork incursion and, as the savage greenskins attack, a malevolent evil begins to stir deep in the ice caves.
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While his Valhallan regiment are happy on an ice world, Cain's biggest concern is freezing to death... until orks start attacking, and then an ancient threat emerges from the depths. Stuck between two enemies, Cain needs to stop playing the hero and actually be one.

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