Exploration in the area dates back to 1936 when a mining company opened up old native workings to expose an ore body described as an irregular vein of dark grey quartz. Analysis of the quartz returned gold grades of 0.5g\t, 19.8g\t, 20g\t, 21g\t and 22g\t Au. In 1959, Messrs Layton and Bareley visited the old mine prospect at Oguakrom, Grab samples of quartz with disseminated sulphides – arsenopyrite, pyrite, lanligite, galena from the old damps show values of 19.8g\t and 20.0g\t. Planning indicates that some of the gold at any rate is free. Work done by Ashanti Goldfields Company (AGC)
Between 1959-1962, Ashanti Goldfields Company Limited (Then Ashanti Goldfields Corporation) undertook a prospecting programme over 15sq. Miles in the Winneba District to the west of Winneba. The prospecting team identified columbite – tantalite in the Mankwadze mineralized belt a few miles west of Winneba. Other minerals identified were gold, spodumene and beryl. In 1994, a geological investigation conducted by Mr. Joe Amanor (Geologist – A.G.C.) on the old Oguakrom Lode Working described the quartz as glassy but shows consistency in assay values ranging from 0.58g\t to 22.1g\t. This led to the acquisition of a 470km2 reconnaissance concession in 1995 by Ashanti Exploration Limited with the old workings as its focal point.
Work carried by Ashanti Exploration Limited (A.G.C.) from 1995 to 1997 (headed by the author of this report) in the area with the Old Workings as the focal point, included the reclamation of eleven old trenches and geochemical sampling. Seven of these reclaimed trenches totaling 140m, delineated a 350x50m mineralized zone. Within this zone, a 6.0m wide mineralized body averaging 2.0 g\t with a strike length of 300m was defined. The geochemical survey carried out in the area identified five anomalous zones including Oguakrom and Awomberew anomalous zones.
The Oguakrom soil anomaly depicted several lensoid type of mineralized structures generally trending NE – SW. The Awomberew soil anomaly delineated among others, a 1200m x 100m, 800m x 75m, 600m x 50m and 1000m x 50m mineralized zones zones. Individual values include 192ppb, 406ppb, 795ppb, 960ppb to a peak value of 5888ppb. This anomaly has high lode gold potential and great attention must be paid to it.Work done by GP Minerals
Geological mapping on the Gomoa Mangoase concession was carried out in March 2011. A total of ninety six (96) rock samples were encountered of which 88 outcrops were sampled and 40 of these were sent to the Laboratory for analysis.
The rocks mostly consist of actinolite schist. Other rock types include amphibolites, hornblendite, andesitic, metabasalts and quartz(Sericite) schist. All the 40 rock samples were sent to the Laboratory for analysis by 50 Fire Assay. Aside a pyritic quartz that returned a gold grade of 0.7g/t, all the other 39 samples returned values less than 0.3g/t The actinolite schist is composed mainly of the mineral actinolite forming the mass of the rock. Theses are greenish needle-like minerals. The hornblendites are generally composed of large aggregate of hornblende minerals forming about 95% of the rock. The andesitic rock has plagioclase feldspar as the dominant mineral composition. Hornblende is almost equally present giving the rock a white and black appearance. Quarts is an necessary minerals. The metabasaltic rock is very fine-grained greenish-grey dense volcanic rock, with few pores. It is compact, massive and unfoliated. It shows visible specks of euhedral (cubic) and anhedral yellow metallic/sulphide (pyrite) mineral grains, mostly less than 1 mm across in size.
The quartz schist is generally compact, massive deformed and weakly to moderately foliated. The rock is dark greenish grey fine – to medium – grained rock. The rock seems to be a compact, massive volcanic or hypabyssal rock now deformed and weakly to moderately foliated. It is apparently metamorphosed.
The amphibolitic samples are dark greenish or ash-grey fine-grained crystalline rock. Iut is compact and massive with hornblende minerals generally oriented.Mapping of Old workings
Alongside the outcrop mapping was the mapping of the old workings. A total of 27 old workings comprising 20 pits, 7 trenches, 1 adit and 1 incline shaft were mapped. Some of these pits go as deep as 50ft. Timbering is the method employed enabling them to go that far.Geochemical Soil Sampling
Soil geochemical sampling of the area was carried out in 2011. The survey was aimed at delineating anomalous zone within the concession and to identify drill targets. Based on previous soil geochemistry, eight blocks were demarcated and covered with 100m x 50m grid system.
The blocks are being referred to as block A through to block H. Blocks A, B & C are located around the Awomberew area whereas blocks D to H are around the Oguakrom area (figure 6).
A total of 1568 samples have been collected including 73 duplicates and 5 standards. All samples were sent to SGS laboratory in Tarkwa for analysis.