OVER ON THE DRY SIDE by Louis L'Amour

Owen Chantry returned to his brother Clive's ranch in the Rockies to find it run by a settler, Kernohan, and his son, Doby.  They'd found Clive outside his cabin, shot dead - a long time dead, and with his pockets emptied...

Owen suspected from the start who had killed his brother, and why.  The Mowatt family, a bunch of tough renegade with an old grudge against the Chantrys, were certain that Clive had buried some gold up in the hills - gold that rightly belonged to them.  Owen figured it wasn't as simple as that, but before he could get at the truth, he had to deal with them Mowatts...

Soft cover, the condition is not great as it seems bookworms have eaten away the bottom right-hand corner of the book, which affects the first few pages as well as the cover.