Minerals mined in Utah include copper, gold, silver, molybdenum, zinc, lead, and beryllium. Polonium alloyed with beryllium provides an efficient neutron source. It is also used in processing aluminium, beryllium, copper, steel and vanadium. The Big Bang also produced small amounts of lithium, beryllium and perhaps boron. Alternatives include brass, phosphor bronze, and beryllium copper. He, and 0.01% deuterium, with only tiny traces of lithium, beryllium, and perhaps boron. Experiments he proposed using beryllium and indium failed. Early versions included a substantial amount of metals such as titanium, beryllium and copper. Beryllium and radium, however, are toxic. Most beryllium is extracted from beryllium hydroxide. This including replacing carbon components in the vacuum vessel with tungsten and beryllium ones. Some magnetrons have ceramic insulators with beryllium oxide (beryllia) added. Currently, most beryllium is produced by reducing beryllium fluoride with magnesium. Once ignited, beryllium burns brilliantly forming a mixture of beryllium oxide and beryllium nitride. Beryl is also an ore source of beryllium.