He hoped the plant would be ready by the end of 2018, Mr Moody said.
Gore Mayor Tracey Hicks said initial work began about three weeks ago and much progress was being made.
The plant was significant for the local economy and he was glad to see it was progressing, he said.
He was excited about the plant's potential to bring up to 100 new jobs the region.
Mataura Valley Milk said in a statement 20% of stakes in the plant would be held by Southland farm suppliers and foreign company China Animal Husbandry Group would own just over 70%.
The remainder would be held by a BODCO Dairy and Mataura Valley Milk directors.
The new pharmaceutical standard plant would produce infant formula, ultra-high temperature cream and small amounts of skim milk powder.