Aim-listed Firestone Diamonds’ share price on the LSE fell by nearly 28% on Friday after it announced that power supply issues had disrupted production at its 75%-owned Liqhobong diamond mine, in Lesotho. The mine receives its electricity from the Muela hydropower station (MHS), which is owned by the Lesotho Electricity Company (LEC). The power station located at the Katse dam, which is part of the Lesotho Highlands Water Project (LHWP).