The present invention is directed generally to the combined use of slurry mining and hydrocyclones to recover hydrocarbons, such as bitumen, from hydrocarbon-containing materials, such as oil sands, and to selective mining of valuable materials, particularly hydrocarbon-containing materials, using a plurality of excavating devices and corresponding inputs for the excavated material. 3 wt % of a biodiesel fuel or a decomposition product thereof, based on the total weight of the lubricating oil composition, comprising:a. The semiconductor component has at least two trenches running next to one another, at least one of said trenches containing a part of the electrode structure. The request and acknowledgement may be communicated using DHCP. The spindle of a greater motor may be secured to the weight which is then secured or coupled to the cylinder.