The 230 staff at the Spring Creek underground mine are nervously awaiting a Monday meeting when Solid Energy management will discuss an internal review and decide how best to combat its money woes.
The mine contributes at least $37 million a year in wages and services to the Greymouth economy.
Chief executive Don Elder announced the widespread review last week after the state-owned coal producer forecast a $200m drop in revenue for the financial year.
There has been strong speculation that the troubled Spring Creek Mine, bleeding more than $5m a month, might be mothballed as a cost-cutting measure.
If it is, it will not be the first time. Spring Creek was mothballed in 2001, just 11 months after it opened, and staff were laid off again in 2004 after concerns about development rates and coal quality. The mine reopened 18 months later, in November 2005, but also spent three months idle after the 2010 Pike River Mine disaster.