https://github.com/ethereum/go-ethereum/wiki/JavaScript-Console#minerhashrate
Looks like its moved to web3.eth.hashrate on geth 1.4.3
This was removed since it was a duplicate of eth.hashrate which is part of the official API.
Thx for reporting this, page has been updated.
@bas-vk @aakilfernandes @fjl I've updated the master branch of a new go-ethereum-wiki repo that I've created where there was mention of this deprecated miner.hashrate property. Maybe go-ethereum deserves it's own wiki repo - or if these doc contributions are handled another way, please let me know.
It is still here https://github.com/ethereum/go-ethereum/wiki/Mining
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It is still here https://github.com/ethereum/go-ethereum/wiki/Mining