The Mozambique Finance Ministry released a statement Monday announcing the reduction, according to Bloomberg.
The ministry said the country expected to produce 7 million tons of coal this year, compared with an earlier estimate of 8.9Mt.
Heavy rains in January killed at least 69 people and interfered with mining and rail operations.
The rain continued in February, damaging the crucial Sena rail line that transports coal from the heavily mined Tete province.
Many companies mining in the region, including Rio Tinto, were forced to call a force majeure for much of the quarter, significantly reducing production and exports.