Directions shown above take you to the Moore Creek Group Camp, which is not located on the Lucky Buck claim.
If you want to camp here, you should make your arrangements through the Stanislaus National Forest Ranger's Station in the Groveland District Office. Their phone number is (209) 962-7825. This group camp has zero amenities and there is a 14-day limit.
Moore Creek Group Camp is located on the Flapjack Flats claim (CAMC0319961), so beware where you prospect.