* Crowd blames medical staff for spreading disease
* Mali reports add to fears virus spreading in West Africa
* Mining companies on lockdown, French hospitals on alert (Releads with attack on MSF, adds quotes, details)
By Adama Diarra and Misha Hussain
BAMAKO/CONAKRY, April 4 (Reuters) - An angry crowd attacked an Ebola treatment centre in Guinea on Friday, accusing its staff of ...