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The offshore region of Sierra Leone and Liberia has been underexplored on the continental shelf and unexplored in deepwater. However, a reconnaissance interpretation of new 2D seismic data, in conjunction with a review of the reservoir and geochemical information available to date, is positive about the hydrocarbon potential of the region. Three distinct prospective hydrocarbon basins are presentโSierra Leone Basin, Liberia Basin, and Harper Basin (Figure 1).
- Africa > Liberia (1.00)
- North America > United States (0.94)
- Africa > Sierra Leone (0.86)
- Phanerozoic > Mesozoic > Cretaceous > Upper Cretaceous (1.00)
- Phanerozoic > Mesozoic > Cretaceous > Lower Cretaceous > Albian (1.00)
- Phanerozoic > Cenozoic (0.94)
- Geology > Structural Geology > Fault (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.95)
- Geology > Geological Subdiscipline > Geochemistry (0.89)
- (3 more...)
- Geophysics > Seismic Surveying > Seismic Interpretation (1.00)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition (0.91)
- South America > Atlantic Basin (0.99)
- North America > Atlantic Basin (0.99)
- Europe > Atlantic Basin (0.99)
- (18 more...)
This paper examines how the understanding of the prospectivity of the Liberia-Sierra Leone Basin has developed over the last 40 years largely due to improvements in seismic data over this period. A series of basins developed between major transform fault zones associated with the opening of the South Atlantic Ocean from the early Cretaceous onward. The Liberia-Sierra Leone Basin forms part of the West African Transform Margin that extends from Sierra Leone to Benin. Early hydrocarbon exploration (1972โ1985) was targeted at shelfal structural synrift traps of Lower Cretaceous age. None of the wells drilled in this period was regarded as a discovery. In 2001, a new regional 2D seismic survey allowed a new play, deepwater Upper Cretaceous channel fans, to be identified. More recent 3D seismic using the latest data acquisition and processing technologies, including AVO, has enabled drillable prospects to be identified. Wells drilled in 2009โ2010 offshore Sierra Leone have established that a working hydrocarbon system exists in this basin.
- Africa > Sierra Leone (1.00)
- Africa > Liberia (0.85)
- Phanerozoic > Mesozoic > Cretaceous > Upper Cretaceous (1.00)
- Phanerozoic > Mesozoic > Cretaceous > Lower Cretaceous > Albian (0.46)
- Geology > Geological Subdiscipline (0.72)
- Geology > Structural Geology > Fault (0.69)
- Geology > Sedimentary Geology > Depositional Environment (0.69)
- Geology > Rock Type > Sedimentary Rock (0.47)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition (1.00)
- Geophysics > Seismic Surveying > Seismic Processing > Seismic Migration (0.76)
- Europe > United Kingdom > North Sea > Southern North Sea > Southern Gas Basin > Sole Pit Basin > B1 Well (0.99)
- Africa > Ghana > Gulf of Guinea > Tano Basin > West Cape Three Points Block > Jubilee Field > Mahogany-1 Well (0.99)
- Africa > Sierra Leone > Liberian Basin > SL-07B-11 > Mercury Field > Mercury-1 Well (0.94)
- (4 more...)
Abstract In this study, an Iron Ore deposit which lies within the Marampa schist formation located in Sierra Leone, that hosts a primary quartz-hematite schist horizon with thickness of up to 65m, was used for eventual block estimation, grade uncertainty characterization and final pit outline design. Additionally, economic sensitivity analysis was done to determine how sensitive the investment will be to certain economic variable changes such as metal price, refining cost, operating cost and other economic parameters that are not known with certainty. The new concept for final pit shape in open pit mine design namely Best Positive Inverted Truncated Cone (BPITC) algorithm is applied in optimizing the pit shape. The optimization results obtained showed that BPITC can always produce optimal solutions for final pit designs and it gives effective information on mineral project decision-making and mining sequencing. The kriging and simulation algorithms revenue evaluation showed nearly the same optimal values at the same cut-off grade. Finally, all the information which can be obtained once drilling has started and in making decisions whether or not to develop the mineral deposit through geo-statistical analysis using GSLIB was shown.
- Asia > Japan (0.30)
- Africa > Sierra Leone (0.26)
- Materials > Metals & Mining (1.00)
- Energy > Oil & Gas > Upstream (1.00)
INTRODUCTION With the introduction of the Law of the Sea Convention by the Third United Nations Conference on the Law of the Sea and the recognition of the rights of coastal states over specific regions of ocean space, new vistas for development, both nationally and internationally, have been created. From a national standpoint in respect of mineral resources, perhaps the most important regions are the continental margins and the 200 mile exclusive economic zone (EEZ).l In article 56 of the Convention, the relevant rights of the coastal state in the EEZ with regard to mineral exploration and exploitation are given as follows: "In the Exclusive Economic lone, the coastal state has.. sovereign rights for the purpose of exploring and exploiting, conserving and managing the natural resources, whether living or non-living of the waters superjacent to the seabed and of the seabed and its subsoil " For some nations, the task of fulfilling this responsibility will be immense especially since the area required may be many times their respective land areas. For others, the magnitude of the task at hand is further heightened by the absence of the means to assess the potential for the occurrence of resources in the area, particularly mi nera1 resources. Of the non-fuel mineral resources with the Exclusive Economic lone, perhaps the group best known and most amenable to relatively proven technology for prospecting and mining are the unconsolidated mineral deposits such as marine placer deposits and sand and gravel. Typical marine placer-forming minerals and their principal commodities of economic interest are native gold, native platinum (including osmium, palladium and other platinum-group metals), cassiterite (tin), chromite (chromium), wolframite (tungsten), rutile and ilmenite (titanium), zircon (Zirconium), monazite (thorium), rare earths such as euxenite and xenotine, and sand and gravel. The frequency with which deposits of each of the above minerals has been discovered, however, varies with the given mineral. While marine mineral placer deposits of rutile and zircon are fairly common, others, such as gold and platinum are quite rare. Moreover, since the probability of finding a given placer mineral deposit is dependent on factors such as the availability of a mineralized area on the adjacent landmass and a mechanism to transport the minerals to the continental shelf, the range of possibilities in different parts of the world is considerable. The principles of placer concentration are well established in the literature. Techniques for investigating the potential of an offshore area for marine placers have been actively pursued on land also exist for marine deposits but, in many countries, they have not been actively used. In many industrialized countries, interest in some cases appears to be shifting to the polymetallic sulphide deposits within the exclusive economic zone. Why then the need for this paper?
- Africa (1.00)
- Europe (0.93)
- Asia (0.93)
- (2 more...)
- Geology > Mineral > Native Element Mineral (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment (0.34)
- Materials > Metals & Mining (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.93)
National Minerals Agency, NMA Compound, New England Ville, Freetown, Sierra Leone Leveraging the value of mineral wealth is a difficult challenge for all countries, but perhaps particularly for those in the developing world, where infrastructural disorganisation, bureaucratic corruption, and civil unrest have been more-or-less endemic for over a century. The aim of this case study is to showcase an African nation plagued historically by all these various afflictions, but which now appears to be endeavouring to get things right. In 2020, a nationwide airborne geophysical survey of Sierra Leone was flown at 150 m nominal line spacing and 50 m nominal terrain clearance. Contractual deliverables included magnetic, radiometric and supporting data streams. The primary aim of the geophysical survey was to provide a national geoscientific benchmark for resource management, and to encourage foreign investment in the rich mining potential of Sierra Leone.
- Materials > Metals & Mining (0.90)
- Government (0.55)
- Energy > Oil & Gas > Upstream (0.33)