BHP (ASX: BHP) was down around 3% in afternoon trade but is still well above the levels it was trading at 12 months ago.
The metals and mining sector on the benchmark S&P/ASX200 index was down about 1.8% this afternoon.
Australian gold major Newcrest Mining (ASX: NCM) was about 1.4% lower at the time of writing while the spot gold price was worth around US$1,298 an ounce, having risen above $1,307/oz on Friday.
Markets are closed in the US and UK today for public holidays.
The S&P500 metals and mining sector had closed down 1.36% on Friday with the biggest drop by Freeport-McMoRan (NYSE: FCX) of 1.73%.
The New York Stock Exchange last week welcomed Stacey Cunningham as its 67th group president, the first female to hold the position in its 226-year history.
London's FTSE100 metals and miners closed up slightly on Friday by 0.56%, with Rio Tinto up a similar amount of 0.51%.
Toronto's metals and mining sector had closed down 1.1% with the biggest fall in copper of 3.4%.
This was mainly due to First Quantum Minerals' (TSX:FM) drop of 3.89%, after news its framework agreement over an option to earn up to 50% of Northern Dynasty Minerals' Pebble project was terminated.