Competition heated up in 2012, as miners pulled together multiple GPU’s into mining rigs to generate more hashing power. Pools continued to form, with some early ones closing down. The big date this year was November 28th, known as bitcoin halving day. On this day, commencing block 210000, the reward for mining a bitcoin block changed from 50btc to 25btc. The price at the end of the year was about $13/bitcoin.
This page gives information extracted from the blockchain showing the best bitcoin mining pools of these years.
2012 Best Bitcoin Mining PoolsBitcoins In Ireland looks at which bitcoin mining pools found blocks during 2012. Data goes from 1st January 2012 -> 31st December 2012. Data gratefully provided by Blocktrail. Note: All blocks found before 27th November 2012 were counted at 50btc. All after 28th November as 25. There may be a minor discrepancy as a result
|1st January 2012 -> 31st December 2012||Total Bitcoin Mined|
|BTC Guild / BTCGuild||440900|
|Discus Fish / F2Pool||27200|