Vitamin B12 Blood Levels Range and Test Results. Normal values of vitamin B12 in blood are between 200 to 900 picograms per milileter. Talk to your lab and request the specific values since every lab values ânormal rangeâ differently.However, these values arenât exactly correct because many people have been diagnosed with B12 deficiency even when their B12 levels were within the normal range.alk to your lab and request the specific values since every lab values ânormal rangeâ differently. However, these values arenât exactly correct because many people have been diagnosed with B12 deficiency even when their B12 levels were within the normal range.
The earliest settlers mined coal among the hills of south central Iowa. They used coal to heat their homes and cook their food in areas were timber was not available. Not until 1870 did the industry of coal mining begin to rapidly grow in Iowa. By that time the major Iowa railroads reached from the Mississippi River in the east to the Missouri River in the west. The railroads leased land in coal producing areas and operated mines which produced coal for the use of the railroads.
The goal of coal mining is to obtain coal from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production.In the United States, United Kingdom, and South Africa, a coal mine and its structures are a colliery.oal mining has had many developments over the recent years, from the early days of men tunneling, digging and manually extracting the coal on carts to large open cut and long wall mines. Mining at this scale requires the use of draglines, trucks, conveyors, jacks and shearers.