[BCMA] Help identifying an Artefact

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I need help identifying this artefact.  It is made of ferrous metal in 2 parts.  The handle is not that robust and attaches to the head with a square shape.  The head has very blunt blade (could not be used for cutting), a shaft where the handle attaches is half square and half round (so the handle can turn on the blade and act like a ratchet) and has a peened head that looks like it is designed to be struck with a hammer.  I've seen two of these so it is not just a one of a kind.  One was dug up in a back yard in Port Moody and the other is at the Grist Mill in Keremeos with no donor info.  Any help would be appreciated.
Jim Millar
Port Moody Station Museum
jim.pmmuseum at telus.net
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