typically have a high potential to produce sulphides within the sediments. the mining of coal and removal of the overburden and interburden can result in the oxidation of the sulphides upon exposure to air and water, generating sulphuric acid. the resulting mine drainage is characterised by highly acidic...
items that are not included in the cost of tour price. ethiopia visas ($ each. you will need to get two if you return to addis ababa at the end of the trip) somaliland visa ($ in addis ababa) hargeisa airport departure tax ($ ) other meals insurance entrance fees flights drinks day arrive in addis ababa...