Exploration for possible economic iron oxide - associated copper-gold (IOCG) and other base metal deposits that may exist within buried Proterozoic basement over a wide area extending NW-SE, from approximately 40 km north-east from Coober Pedy down to near Lake Cadibarrawirracanna, began with a review of historical data and the interpretation of airborne geophysical data. Due to the region generally having an indicated 100 to 300 m thickness of Phanerozoic cover on basement, it was decided that geochemical exploration methods would be largely ineffective there. Nevertheless, 44 calcrete samples and 2 rock chip samples were collected in the south-east of EL 2201 near Coorillinna Bore where a possible shallower basement depth was interpreted. A peak value of 2.1 ppb Au was returned, with no significant arsenic or copper values recorded. Ground magnetic surveys were next conducted, to check the position of prospective magnetic features and refine basement depth estimates, and the results combined with assessment of previous BHP drilling results confirmed three anomalies as potential drilling targets (fault-bounded granite plutons with associated magnetic aureoles, that are cut by regional north-west trending shears). A geological consultant was retained by Goldstream to examine stored drill cores from previous company drilling, and he re-logged a number of drillholes to look for IOCG type alteration, and selectively sampled hole SR02 for assaying intervals of interest. In addition, 3 drill core samples were submitted for petrological study, and this disclosed possible Hiltaba Suite tonalite and granulite facies gneiss containing minor thin quartz-carbonate veins with some pyrite, chalcopyrite and fluorite. During mid-1999, after making a re-interpretation of the geophysical data to optimise proposed drill collar locations, Goldstream drill tested the M5 magnetic anomaly on Warrina South EL 2201 via 5 inclined RC holes for a total penetration of 972 m. Prior to starting the main programme aimed at the crystalline basement, some scout RAB and aircore drilling (4 holes for ~ 200 m) was also conducted on each of the M5, M12 and M14 targets to investigate the nature of the cover sediments. The RC drilling encountered Proterozoic granites beneath 70 m thickness of Mesozoic (Cadna-owie Formation and Bulldog Shale) and Cainozoic cover. Altered granite skarn rim rocks are present, that include pyroxene, amphibole, garnet, magnetite +/- pyrite and pyrrhotite. Basement samples from four of the drillholes returned significant anomalous base metal assay results, with best intercepts including 16 m @ 0.57% Cu and 0.16% Ce+La from beneath 184 m depth in hole PD99WS003, and 12 m @ 0.14% Cu from 126 m in hole PD99WS001. During August-September 2000 Goldstream undertook regional exploratory drilling (15 vertical RC holes for 2561 m) that targeted ten magnetic and gravity anomalies, in a programme jointly funded by the SA Government as part of PIRSA's TEiSA Initiative. Eight of the targets were on Warrina North EL 2200. At anomaly CP1 the drilling of hole 2000WS006 encountered a sulphide-mineralised intercept within unaltered but brecciated granite, of 16 m @ 0.15% Cu from below 164 m depth. This find confirmed the discovery made by Aquitaine Minerals in 1981, of 5 m @ 4320 ppm Cu from 110 m depth in hole SCH001. Significant chlorite/haematite and carbonate alteration was found in gneissic basement rocks drilled at the CP7 and CP9 anomalies respectively, while the rocks at the remaining anomalies are characterised by the presence of intervals of disseminated magnetite, but appear not to contain any discrete iron oxide bodies. Another 5 inclined RC drillholes for 1173 m were completed before this programme commenced, as step-out tests of the Cadi prospect. Their results have extended the area of mineralised skarn by 300 m westwards and 200 m to the south, so the total area of mineralised ground is now 600 m x 400 m, and remains open to the north and east. A best drillhole intercept of 4 m @ 0.34% Pb plus 0.48% Zn was obtained from below 138 m depth in hole 2000CADI7, that included 4 m @ 0.03% Mo from 136 m. Early in 2000 Goldstream conducted a trial dipole-dipole IP survey consisting of 3 short lines laid out over the CP3 (Cadi) and CP 12 prospects. However, the method could not detect any sulphide response from the known skarn mineralisation buried under a 40-70 m thickness of cover. The company intends to attempt a second IP survey over Cadi at a future date, using improved equipment and a larger sensor array to try to achieve effective signal penetration and identify the sulphide zone, hopefully over an economic width. It is also proposed to conduct a close-spaced ground gravity survey at the CP1 prospect to try to identify a source for the anomalous copper mineralisation found there.