Chris France, NYMNPA director of planning, said: "Planning policy is that major development should only take place in national parks under exceptional circumstances.
The NYMNPA report will be publicly available via the authority's website ahead of the meeting on June 30 and will also be published on York Potash's website.
A "straddling application" has been submitted to both the NYMNPA and Redcar and Cleveland Council (RCBC), as the tunnel would run through the National Park and beyond its boundary to Teesside.
York Potash withdrew and revised its original 2013 planning application to the NYMNPA, changing its design from a slurry pipeline to an underground conveyor system as the proposed method for transporting the mineral to Teesside.
We realise the NYMNPA
recommendation is not binding on the borough council, but hope strong consideration will be given to it when its planning committee decides.
is now looking at ways it can help groups access the North York Moors in future, but this depends on whether Central Government grants are cut further.
Bernie McLinden, NYMNPA
head of park management, said: "We are only a few weeks into the summer, but have already had several fires.
Andy Wilson, NYMNPA
chief executive, said: "This is a tribute to the continuing hard work of our staff, members and volunteers and the excellent team spirit that exists between them all.
Funding is from Yorkshire Forward, the European Regional Development Fund, Heritage Lottery Fund, Yorventure and the NYMNPA