Gold mine claims staked by my grandfather & sold to large gold producer with royalty agreement & royalties to be paid to heirs.

The agreement is in a huge binder and one of the stipulations is that regular accountings of the royalty account are to be done. Mine has been sold several times to major international mining companies and more than one million ounces of gold has been produced. No accounting of royalty account has been provided despite many requests, and attempts to gain information has been met with disdain and worse. Mine is in Canada, mining companies have been U.S. with Canadian subsidiaries. Last request was met with copies of selling OUR royalty account among 3 companies, all offshoots of big main company, at same address, with same officers, and much smoke and mirrors. I suspepct fraud or collusion or worse. What can we do since we don't have the money to hire a lawyer unless contingency?