I think any gold you can find on their property should be considered a modest payment for any prospecting you could do for them. Seems like many juniors follow and appreciate any artisinal mining on their property. Any help finding where and how the gold is would be a benefit in my opinion. I'm sure they appreciate it - as long as they you have asked for their permission, which you have. I know I do.
Finding a 10lb'er would do more for GNH the value of the rock could ever do! Where there is smoke there's fire.