There are many bitumen and bituminous products but typically they go into applications such as roofing, damp proofing, waterproofing, paints, car parks, road, runways, fence treatments and so on.

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. ... Some iron and steel making and other industrial processes burn coal.

Gold is an asset that investors tend to rely heavily on in times of political or fiscal uncertainty. Unlike a currency, the amount of gold can't be expanded at will, and unlike a stock, there's no underlying company that can go out of business. As a result, the metal is often used as a hedging tool against inflation or currency devaluation. However, when any investment becomes too popular there's the risk of a price bubble being created, which could send prices spiralling when it bursts. For this reason, many gold traders choose to diversify into other markets.