Banro Corp. fka BAA

[adama2000]

Fluid sources in the Twangiza–Namoya Gold Belt (Democratic Republic of Congo): Evidence from tourmaline and fluid compositions, and from boron and Rb–Sr isotope systematics

Highlights

• First assessment of the hydrothermal system in the Twangiza–Namoya Gold Belt.
• Boron isotope data reveal different boron sources.
• Rb–Sr isotope data identify late-Kibaran pegmatite and early-Pan-African vein emplacement.
• Hydrothermal fluids appear to be sourced mainly from the meta-sedimentary host rock.

http://www.sciencedirect.com/science/article/pii/S0301926816301280

Found this study today
Sorry, I don´t know if this is only science or maybe important for the future. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors.(wikipedia)