It's been a busy start to the year for the development-stage gold miners as several names rush to get out economic studies to showcase their projects at the best possible metals prices. Lumina Gold (LMGDF) is the most recent name to release an economic study, and the updated Preliminary Economic Assessment has added to the mine life at Cangrejos and envisions an annual gold production profile of over 350,000 ounces. However, while the higher After-Tax NPV (5%) and increased mine life are impressive, this is offset by significantly higher upfront costs to put