Bitcoin miners' September reports showed mixed results amid market volatility.

- Hut 8 and Irish Energy continue to expand, but efficiency and production are variable.

- Bitfarms reduced production to 217 BTC in September due to network difficulty increases, but met efficiency targets.

- Iris increased production to 347 BTC, increasing hashrate to 21 EH/s.

- CleanSpark increased hashrate by 187% year-over-year, reaching 27.6 EH/s.

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