Changes in the Roman Catholic Church, Sydney Mail, 15 November 1862, p 3, http://nla.gov.au/nla.news-article166693355:

We are informed, from a reliable source, that the following changes are about to take place. The Very Rev. Dean Lynch has been appointed Vicar Foran, with spiritual jurisdiction over the members of his church in the district of New England, the Clarence, &c. The reverend gentleman, after a residence of twenty-five years in Maitland, will in future be stationed in Armidale. He will be replaced by Dean O'Connell as Dean of Maitland. [...]—Armidale Express, November 8.

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T.W. Campbell, The Priests of the Diocese of Armidale: A Necrology, Braddon ACT, 2005:
Lynch, John Thomas

Born 1816 in Dublin, exact date unknown. Details of education unknown. Studied at Maynooth, and volunteered in 1837 for the Sydney mission in response to an appeal by William Ullathorne, vicar general of the Sydney diocese. He arrived in Sydney on Cecelia on 15 July 1838, as a deacon. He was first stationed at East Maitland with Edmund Mahoney. After ordination to the priesthood in October 1838, place and exact date unknown, he was given responsibility for West Maitland, where he remained until 1862. From West Maitland he travelled extensively into the New England and north coast regions of New South Wales. He may have been responsible for the first church structures in Armidale and Tamworth. In November 1862 he was appointed to Armidale to replace Timothy McCarthy. He remained there for a number of years. From October 1869 to July 1870 he travelled overseas, met newly appointed Bishop Timothy O'Mahony, and was appointed by O'Mahony as his vicar general. Disappointed that he had not been appointed to the bishopric there was friction with O'Mahony when the bishop eventually arrived in his diocese in March 1871. Towards the end of 1871 he was transferred to Tenterfield, where he remained until he travelled again to Europe in mid 1873. While in Rome on that trip he was made a Monsignor on the recommendation of Cardinal Paul Cullen, the first Australian recipient of the title. In May 1875 he transferred to the Sydney Archdiocese and was appointed to Pyrmont (to 1877), then to Campbelltown, where he died on 17 February 1884. He was buried at Petersham cemetery. Independently wealthy he left substantial bequests each of £1,250 to the Sydney Archdiocese, the Maitland and Armidale dioceses. (Sources: O'Brien, Farrell, Advocate 25 Sep 1869 p 5, 16 Oct 1869 p 5, 25 Jan 1873 p 7, 1 Mar 1873 p 7, 21 Nov 1874 pp 4, 7, 13 Nov 1875 p 7, 16 Feb 1884 p 19, 23 Feb 1884 pp 14, 19, 1 Mar 1884 pp 17, 18, 15 Mar 1884 p 16, 17 July 1884 p 18, 14 Aug 1884 p 7, FJ 23 Feb 1884 p14, MDHC A-Z L93).

(Reproduced by permission of Tom Campbell.)

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Denis M. Long, Pioneer and Early Priests, Archdiocese of Brisbane, Deceased or retired by 1929, 2021, pp 91-92:
Priests of whom we know little

The names of these priests appear on the Sick and Infirm Priests’ Sustentation Society prayer card for deceased priests, but of whom our knowledge is limited. [...]

..., Lynch: This priest was remembered by the priests of 1928 as having served in the diocese. It was Dean John Lynch, who was appointed as Dean of the Armidale district, after almost 25 years at West Maitland? He had cordial relations with Bishop Quinn who at one time invited him to serve as a Vicar General in Brisbane.(1) Dean Lynch returned to the Sydney diocese as parish priest of Pyrmont. As Monsignor John Thomas Lynch he was parish priest of Campbelltown where he died in February 1884.

Footnotes
1. Rev Dr Chris Hanlon, His research into early Colonial Queensland.

Reproduced by permission of Fr Denis Long.