Vedanta's Lisheen closure, page-2

Yes, Hindustan Zinc must be very frustrated with IRL being given administrative approval for the Aravalli Zinc/lead project.
It was announced on the 24th Dec 14 that IRL had received " administrative decision made by the Government of Rajasthan approving the Aravalli lead-zinc mining lease application in favour of IRL’s wholly owned subsidiary, Crown Mining Private Limited (CMPL)"

The Aravalli project has been split into two parts A and B.  Part A being the significant project area.

"following demarcation work has resulted in a split of its original licence area into Part A and Part B areas (Figure 1 below). Part A located in the south end of the licence area comprises 17.29 km2 and contains the base metals mineralisation exploration target previously reported by IRL. "
"CMPL is prioritising the grant approval process for Part A and has now officially consented to the revised boundary of Part A in an acceptance letter and revised map forwarded to the directorate of Mines and Geology (DMG) in Rajasthan, India."

Hindustan Zinc were originally granted this area in 1993, but was taken off them since they didn't work on the project. Hindustan Zinc have appealed against this decision previously and their application was rejected in 2010.  HZN are extremely unhappy with the fact that IRL have been awarded the Aravalli project and as a result HZL have appealed again.
Its rather obvious that the Aravalli project is of huge significance otherwise HZN would not be going to these lengths to obtain the Aravalli ML themselves.