There's a bit of misinformation in this thread. A lease holder can, in fact, post the property as no trespassing. He/she is basically renting the property from the government and can restrict access to it as well as the roads through it. While many lease holders allow movement through their lease hold lands, others do not. You need to take it up with the specific lease holder.
https://www2.gov.bc.ca/assets/gov/fa...2016_final.pdf
https://www2.gov.bc.ca/assets/gov/fa..._factsheet.pdf
From the BC Land Act.
Right of possession to acquired Crown land
65
Except as otherwise provided in this Act, a person lawfully entitled to occupy Crown land under a certificate of purchase, lease, right of way, easement or licence of occupation may, for that land, take proceedings against any person for recovery of possession of, or for trespass to, the interest in the land in the same manner and to the same extent as if the person were the registered owner of the land.
Just to muddy the waters a wee bit more, a grazing lease is quite different to a grazing license. A license allows for cattle grazing, a lease is a true lease on the land.