Looks like the mine site has good road access to me. If this is indeed the mine. Notice the rough road heading south leads to another mine where the road is called St Andrews Gold Fields Road.

Shepp

http://maps.google.ca/maps?f=q&source=s_q&hl=en&geocode=&q=matheson+ontario&sll=49.891235,-97.15369&sspn=32.073578,79.013672&ie=UTF8&hq=&hnear=Matheson,+Black+River-Matheson,+Cochrane+District,+Ontario&ll=48.610583,-80.829817&spn=0.004001,0.009645&t=h&z=17>