As per reports world average cost for mining 1Bitcoin = $7275.798
After halving in 2020= World average cost will become $14551.59 per Bitcoin. But China's average cost will still be under $8000.
Fun fact as per this report it costs $3172 to mine 1bitcoin in China (Where majority of bitcoin MINING happens),which was also Bitcoin bottom of 2018.
Source- Google and crypto India telegram