So I am a Rank 20 Miner and would like to acquire Prospect III. The "spell" is 6,000 GM at the Miner's Guild. I have been doing the 20ish Guildleves at Camp Horizon for a few weeks now but seem to not be acquiring many Guild Marks (I've only a few hundred) even though I do both the Leves available at Camp Horizon each day I am online. What am I missing?