Hi Dave and welcome to the forum.
Sorry I can't help with any information but it is an amazing find - congrats.
The fact that it was buried that deep and at a known location gives the axe good provenance, which is often lacking in these artifacts.
A quick google search shows a wide range of conditions for bronze artefacts and like you suggest, the amount of deterioration must depend greatly on the buried environment.
Please let us know if you find out more about the axe.
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