ustomization of the Microsoft Excel spreadsheet to input information in both string and numeric formats in order to developed frequency distribution tables’ charts, graphs among others.
3. Results and Discussions
3.1. Methods of Artisanal Gold Mining in Baomahun
The method(s) of gold mining depend on the ecology, size of ore deposit of the gold mine. The study revealed that the open pit mining method recorded the widely used artisanal gold mining method in the study area, as confirmed in the questionnaire administered 100% while underground mining method recorded the least 16.67% used by miners in their operations (Figure 1).
3.1.1. The Open Pit Surface Mining Method
This method is applied in swamps within the enclave of Cluff Gold concession area and in Kangari forest reserve areas. This method recovers valuable minerals from large, thick ore bodies lying close to the surface of the earth miners prepare the ground at a pre-prospected site, and excavate the pay material or earth overburdens. The depth of the pit depends on the depth of the gold bearing gravel. Then they pile it up for washing to separate and recover the valuable products. Mining pits are constantly being filled with water as miners dig. Small Petrol driving pumps preferably E-Y 20 Robin are used for dewatering the pit but sometimes bailing out of the pit was done by hand using head pans. The open pit surface mining usually disturbs much large area. These miners leave behind pit ranging in dimension from 2 m × 2 m to 200 m × 600 m (Plate 1).
3.1.2. The Underground Mining Method
This is employed by artisanal gold miners when the rock-bearing ore lies deep beneath the surface of the earth to get out with surface mining. First the miners
Figure 1. Artisanal miners’ response on methods of gold mining in Baomahun (Source: Author’s field survey data, 2015).
Plate 1. Artisanal miners working in an open pit filled with water. (Source: Author’s field survey data, 2015).
dig a vertical opening into the mine called a shaft using hand tools such as hammers; hand forged scrap-steel chisels and spades. Then they drive a nearly horizontal or sloping mine entrance passage into the side of the hill called an adit. From these main passages, miners dig systems of horizontal passages called levels running the risk of collapsed walls and oxygen shortages to extract the gold that the world demands. However, some miners used old adit left by former mining company in the area.
3.2. Processes (Techniques and Procedures) of Artisanal Gold Mining in Baomahun
A simple wooden rectangular sluice box a few feet in length called canoe is used for washing the gravel. A dark red wool carpet is put inside the canoe to trap gold particles, and wire mesh is placed inside the box to retain large stones and other unwanted materials. A series of wooden rifles or steps are placed on its route designed to help break the flow velocity of the water as it travel down the sluice. The mineral-bearing gravel and sand are first shovelled into the upper end of the canoe and are washed by the force of water shooting out through a small petrol driving pump mostly E-Y 20 Robin. The force generated keeps gold particles from sinking easily. As moving water carry the ore or alluvium down the steps of wooden riffles that had been earlier placed on its route, the carpet and riffles covering the bottom of the sluice trap the gold particles. When the gravel removed for washing is finished, the water source (small petrol-driven pump) is turned off and the carpet contents are ready to be removed. Carpets or other capturing devices on the bottom of sluices can be removed and washed in a big rubber bowl to remove the captured dense material (Plate 2).
Plate 2. Artisanal gold washing process in Baomahun using a wooden sluice box. (Source: Author’s field survey data, 2015).
Panning is often done after sluicing have been completed. The carpets content of pebbles and sand that stick to the gold in the sluice box is washed in a big rubber bowl to remove the content and the dense materials are placed in a medium sized, curved head pan along with water to separate heavy gold particles from other lighter particles. This last stage of requires the service of experienced and professional gold miners. After a succession of shifts designed to get rid of lighter sediments along with water have been completed, gold due to it density, will be exposed on the bottom of the head pan for the miner to recover. The decision to either uses elemental mercury or not is made at this stage but it all depends on the size of the gold. The final content is heated with fire in a head pan to dry up water left and recover the gold.
3.3. Use of Mercury as Supplementary Recovery Techniques
Mercury is used for gold amalgamation in artisanal mining as an affordable means to pick up small gold particles from sediment. In this process mercury and gold-carrying silt are combined to create a hardened amalgam, the amalgam is later heated over an open flame to separate the mercury from the gold.
Majority 24 (80%) of the miners denied ever using mercury while a few 6 (20%) miners admitted to the use of chemical, particularly mercury (Plate 3).
3.4. Effect(s) of Artisanal Gold Mining on the Environment
Mineral extraction is the most destructive industry to the environment and artisanal mining is a major contributor to this destruction  . There were varied degrees of visible impacts of artisanal mining on the environments in Baomahun.
Results from the analyzed data collected show visible effects like soil depression to be the highest percentage recorded 37.11%. This is associated with haphazard excavations  ; and  . The creation of water pools in abandon unfilled mines that become traps for animals and breeding grounds for vector of
Plate 3. An artisanal gold miner holds mercury container and mercury amalgam in his palm within Cluff gold concession area in Baomahun (Source: Author’s field survey data, 2015).
Table 1. Local residents’ perception on gold mining visible environmental impacts (Source: Author’s field survey data, 2015).
*NB: Responses represent respondents’ first choice (a lot of them noted more than one visible impact).
water borne diseases such as malaria account for 35.05%, while turbidity and diversion of stream account for 27.84%. None of the respondent noted air pollution as a visible effect of artisanal gold mining on the environment.
An accurate evaluation of environmental impacts is a capital-intensive process which involves the efforts of experts   and  . However, answering the question of significance as spelt in the questionnaire, the techniques of personal observation in conjunction with existing credible scientific evidence was used to verify the information of respondents that the present magnitude of the impacts noted earlier is significant and which bears the highest percentage of 77.78%, followed by 16.66% for very significant (Table 1).
3.4.1. Temporary Diversions, Siltation and Sedimentation of Local Streams
Artisanal gold mining operations are inherently disruptive to the environment. The most obvious effect of mining observed and attested to by respondents were the temporary diversions, siltation and sedimentation of local streams. Water body’s disturbance by surface mining is caused where overburden is moved for washing (Plate 4).
Plate 4. Evidence of stream turbidity, diversion, and sedimentation (Source: Author’s field survey data, 2015).
Plate 5. Evidence of visible environmental impacts. A scene of pool of water in an unfilled mined pit in Baomahun (Source: Author’s field survey data, 2015).
3.4.2. Creation of Water Pools
The study revealed that after mining, miners left behind many unrecovered exploited mining pits. These pits cause animal traps and health hazard including serving as breeding grounds for vector of water borne diseases such as mosquitoes―the agent that spread malaria due to stagnant water collection after being abandoned by miners (Plate 5).
3.4.3. Soil Depression
The study has shown that artisanal gold mining is carried out in inland valley swamps that are used for rotational subsistence agriculture (i.e. rice cultivation and as well as vegetable gardening). The uncontrolled digging and turning over of top soil that is rich in plant nutrients by miners caused destruction of land beyond economic and technical reclamation and thus makes land unfit or unfavourable for agricultural use. Since agricultural productivity is closely linked to environmental factors including soil quality and water availability, provisioning services such as food (security) can be threatened or compromised by mining-related factors such as loss of agricultural land; water pollution; water supply. This may result to change in the surface hydrology (Plate 6).
3.5. Effect of Artisanal Gold Mining on Environmental Health
The health risks associated with mining in general related activities have out-weighed any social and economic or financial benefits that might accrue. Artisanal gold mining has a number of activities, each of which has potentially-adverse impacts on the health of communities based in close proximity to operations.
The study shows that residents suffered from mining related ailments. Malaria was recorded as the most prevalent and bears the highest percentage of 29.41%; this is because the open mines left behind by mining carry stagnant water, which are favourable breeding grounds for mosquitoes. Cold and catarrh bears the second highest percentage of 17.65%, followed by skin diseases (15.44%) (Table 2).
Plate 6. Scene of soil depression (Source: Author’s field survey data, 2015).
Table 2. Diseases frequently contracted by respondents (Source: Author’s field survey data, 2015).
*NB: responses represent respondents’ first choice (there were a lot of them who noted more than one form of diseases).
3.6. Effect of Artisanal Gold Mining on Livelihood Foundation of Baomahun Local Communities
The effects of artisanal gold mining on livelihood foundations of local people in Baomahun community presented a mixed picture of positive and negative impacts on a large spectrum of issues. Table 3 shows the data obtained from the local residents surveyed regarding the effects on livelihood experienced from artisanal gold mining in the community. Majority 23 (57.5%) of respondents admit to have benefited considerably from gold mining in terms of improvement in their businesses, which they attribute to the presence of mining.
On the contrary, some of the other respondents who make up minority 17 (42.5%) admitted that they have experienced the effects of the gold mining on their livelihood mainly as negative. The explanation they put forward was: Their livelihood is built on agriculture, and that Artisanal miners literally convert vast tracts of arable life-sustaining land (both rain-fed upland and swamp-based fields) into waste land. After mining for gold, gold miners leave behind a trail of destruction (the overburden and tailing) as evidenced by the deep unfilled pits. Topsoil buried and sub stratum is brought to the surface, this mix in soil strata make the soil unfit for agricultural purpose. Also the use of local streams for mineral concentration by artisanal miners results in accelerated evaporation of surface water posing a threat to water-use efficiency for agricultural activities of economic importance such as animal husbandry, aquaculture and irrigation. And agricultural productivity is closely linked to environmental factors including soil quality and water availability. Furthermore, few local residents said miners contaminate environmental goods and services, including provisioning services such as water and this have far reaching costs on entire families which have direct effect on households.
Haphazard deforestation due to the expansion of mining activities or the discovery of new mining “hot spots” can inadvertently have an adverse effect on the ability of the local non mining population with particular reference to forest users such as traditional healers who depend on the use of medicinal herbs from forest to achieve and sustain economic self-sufficiency.
3.7. Implementation of Legal and Administrative Mining Policies
Inadequate regulation and enforcement is a common observable fact in the artisanal mining sector. This is largely attributed to the political perceptions and
Table 3. Local residents’ knowledge on gold mining impacts on livelihood (Source: Author’s field survey data, 2015).
attitudes towards the sector as governments tend to favour the interests of and prioritized large concession holders whenever possible over artisanal mining. The research revealed that this political marginalization of the sector is undermining the policy and legal frameworks of the mining industries in myriad of ways, some of which are mention in the following list.
3.7.1. The Use of Child Labour
The study showed that in almost all mine sites visited, miners used children as labour to perform daily mining chores. This is in bridge of the national mining act and international law to which Sierra Leone is a signatory. This can increase the risk of exposure and addiction to alcohol and drugs. In addition, it can also disrupt or prevent their access to education (Plate 7).
3.7.2. Assigned Number of Tributers per Acre
The researcher had very good information on the numbers of tributers per artisanal mining license exceeded the set limits of fifty. This contravenes Section 91 sub section 3 of the Sierra Leone’s Mines and Minerals Act of 2009. The ultimate drivers of this are the lack of trust and pursuance of individual interests by the stakeholders.
3.7.3. Rehabilitation and Reclamation of Mined-Out Lands
The study revealed that holders of artisanal mining license renew their licenses without undertaking rehabilitation and reclamation of mined out areas or paid the prescribed fee.
The Director and authorities responsible for the protection of the environment do not come inspect the mined out land prior to the renewal of a license as mandated by the act. This contradicts Section 90 sub sections 1 and 2; and Section 91 sub section 3 of the Sierra Leone’s Mines and Minerals Act of 2009, respectively.
The research revealed that the methods used by artisanal gold miners in their
Plate 7. Undeniable evidence and proof of the use of child labour in mining site. (Source: Author’s field survey data, 2015).
operations vary and depend on: the geology and topography of the area; location, type, size and orientation of the mineral resource. In Baomahun, open pit mining method is used to dig and extract gold in inland valley swamps and forested areas, while both open pit mining and underground mining methods are used in the hills. The latter is practiced mainly in the dry season. The study has also shown that miners use chemicals such as elemental mercury as a supplementary technique to recover more gold particles from sediment.
Artisanal mining and large scale mining operations have some common effects on the environment but the nature and magnitude are different. The visible effects of artisanal gold mining on the environment are the soil depression and the creation of water pools in abandoned unfilled mines, temporary turbidity, diversions, and sedimentation of local streams.
Significant gaps and disparities exist in the implementation of the new Mines and Minerals act of 2009 on the artisanal mining sector. The research finds out that the number of tributers per artisanal mining license exceeds the set limits of fifty. There is undeniable evidence and proof of artisanal license renewal without the rehabilitation and reclamation of mined out areas by license holder. Evidence is rich on the use of child labour in artisanal mining site by miners.
Cite this paper
Sheriff, I., Gogra, A.B. and Koroma, B.M. (2018) Investigation into the Impacts of Artisanal Gold Mining on the Livelihood Foundation of Baomahun Community in Southern Sierra Leone. Natural Resources, 9, 42-54. https://doi.org/10.4236/nr.2018.92004