SANTIAGO, Aug 25 (Reuters) - Chile's mining regulator

Sernageomin has added requirements for Codelco to restart areas

affected by a deadly collapse at its El Teniente copper mine in

July, according to a document seen by Reuters on Monday.

The regulator will now require a follow-up and monitoring

plan for the stability and safety of mining operations across

all underground deposits of Codelco's El Teniente mine,

according to a Sernageomin document.

In a statement this weekend, Codelco said it had received

approval from Sernageomin to restart its Andes Norte and

Diamante sections of El Teniente, but the document detailing the

authorization obtained by Reuters on Monday revealed the

increased requirements for sectors still shuttered by the

collapse.

Sernageomin had already requested analysis of potential

causes and control measures report to prevent new incidents; as

well as a mine recovery and repair plan; and a technical report

assessing existing fortification systems with proposals for

improvement.

Codelco, the world's largest copper producer,

cut its copper forecast

for this year due to the impact of the accident, which

killed six workers.

The collapse mainly affected the new Andesita

development, but Andes Norte, which had begun extraction, and

Diamante were also halted as part of the investigation.