For thise interested, I didn't know what the significance of a...

For thise interested, I didn't know what the significance of a Hydrothermal system was so I googled it...basically means there could be gold there.

Hydrothermal gold deposits (epithermal, Carlin-type, and orogenic) have accounted for >75% of lode-gold production. Although these deposits form in distinctly different geologic settings and by different ore-forming processes, they have a number of geochemical similarities. These include their temperature of formation over ~200°C range, bulk composition of ore-forming solutions, and elemental associations. The ores predominantly form by either igneous or metamorphic hydrothermal processes, but Carlin-type ores may also require a sedimentary hydrothermal contribution. Gold is transported by the ore-forming solutions as aqueous H2S(aq) complexes or its dissociated equivalent, bisulfide, and dissolved gold concentrations may reach the ppm level. Gold in gold-rich ore-forming solutions locally may form nanoparticles that are physically transported to the place of ore deposition. Other elements that also have an affinity for dissolved H2S in hydrothermal ore-forming solutions include silver, arsenic, tellurium, selenium, mercury, antimony, and thallium, and they may be enriched in gold ores and be useful elements for exploration geochemistry