Should the following be sufficient merkle root, block number, previous block hash, timestamp and nonce?
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If you are looking to find the miner's address, you will need the full block, not just the header.
The miner's address will be transaction 0 of the block, also known as the coinbase transaction. Like all the other transactions, it is included in the Merkle Root in the block header, but not in the block header itself.