BHP $25 by FEB, page-109

mate I've been trading and investing for over 20 years, and made a lot of money from BHP before the 2008 GFC.
yes there was that dam disaster.
but other mining companies share prices crashed a lot in 2014 - 2016 also, due to falling commodity prices.
eg MIN fell from $12 to below $4
RIO fell from $70 to below $37
FMG fell from over $5 to about $1.40
were they affected by Samarco ???
so my point was that there is no need for a general market crash ( 1929 style ) in order
for mining company shares to fall a lot. as happened in 2014 - 2016 when the XJO fell about 20%
but mining shares fell by a lot lot more.
commodity prices tend to be very cyclical.
BHP is a great company but periods of large share price falls are to be expected with mining companies.