The correct answer is: b) Small-scale and artisanal mining.
Mining in Mizoram is primarily small-scale and artisanal, with a few larger mines. The main minerals mined are coal, limestone, and dolomite. The state government has been trying to promote large-scale mining in recent years, but this has been met with resistance from local communities who are concerned about the environmental impact.
Option a) is incorrect because large-scale industrial mining is not the norm in Mizoram.
Option c) is incorrect because offshore extraction is not a significant source of minerals in Mizoram.
Option d) is incorrect because mining does occur in Mizoram, although it is mostly small-scale and artisanal.