Plenty of exploration companies are busy drilling this summer, and Blackheath Resources (TSXV:BHR) is no different. Following successful phase 1 and 2 drill programs at its Portugal-based Covas tungsten project, the company announced today that a phase 3 drill program has commenced. It's aimed at expanding known zones of tungsten mineralization on the property. Focused on the development of tungsten projects in Portugal, Blackheath holds an option from prospect generator Avrupa Minerals (TSXV:AVU) to earn up to an 85-percent interest in a joint venture in Covas. The project, which is operated by Avrupa, is a past-producing mine with a historic resource of 922,900 tonnes of 0.78-percent WO3. Goals for the program According to a press release from Blackheath, the phase 3 program will feature as many as 15 shallow diamond drill holes for a total of approximately 1,100 meters. Those holes have been "designed to expand the known zones of tungsten mineralization on the property." Tungsten Investing News spoke with Blackheath's president, Alex Langer, who explained that while the first two programs at the property were "more exploration based," the current program is "going to be smaller step outs from the known historic resource." In other words, drilling at Corvas is honing in on promising portions of the property. Langer reiterated that the resource is currently "not NI 43-101 [compliant]." However, the company has plans to get to that stage. "Our goal is to start to combine some of these areas and bring them closer together into something that may be useable in a NI 43-101 in the future," he said. Avrupa is also happy about the start of the program. Echoing Langer's sentiment, Avrupa President and CEO Paul W. Kuhn stated, "[i]t is exciting to get the third phase drilling campaign started, as we will be keying in on known high grade WO3 areas around the Covas prospect. The JV has put a lot of energy into upgrading the targets this year, with a strong surface exploration effort, and we are looking forward to positive results from Lapa Grande, Castelo, and Telheira, in particular."