Shipping Intelligence. Arrived, South Australian Register, Adelaide, 22 June 1868, p 2, http://nla.gov.au/nla.news-article39177918:

Saturday. June 20.
Rangatira, steamer, 440 tons, H. Grainger, master, from Melbourne June 17. [...] Passengers—[...] Revs. Nolan and McClasky, in the cabin [...].
Sunday, June 21. [...]
Coorong, steamer, 304 tons, W. McLean, master, from Melbourne June 16, via Belfast June 17, and Wallaroo June 20. [...] Passengers— [...] Revs. M. O'Rourke, M. Quinlan, and Holden [...]

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Accession to the Roman Catholic Clergy, South Australian Register, Adelaide, 24 June 1868, p 2, http://nla.gov.au/nla.news-article39183369:

We published in the passenger-lists of the Coorong and Rangatira on Monday the names of several clergymen of the Roman Catholic Church, who have come to the colony at the instance of the Right Rev. L.B. Shiel. We have been able to glean the following information with reference to them:—The Rev. P.F. O'Rourke is a Capuchin friar of the order of St. Francis. He completed his noviciate at the Convent at Frascati, about 10 miles from Rome, and made his studies at Chambery, in Savoy. Father O'Rourke laboured for some time upon the English mission, and then for three or four years at the Capuchin Chapel, Church-street, Dublin. Father the Rev. James Quinlan volunteered for the Australian Mission directly after his ordination, at the invitation of Dr. Shiel, from St. John's College, Waterford, of which diocese he is a native. The Rev. James Nolan, O.S.A., is a native of the City of Dublin. He made his noviciate at Tolentino, in Italy, as an Augustinian, studied Philosophy at Fermo and Divinity at Rome, being subsequently ordained priest at Maierata, in the diocese of Tolentino. The rev. gentleman has been on the mission seven years in the dioceses of Armagh and Limerick. The Rev. Mr. McClusky is a sub-deacon. He is a native of Derry, but studied his course of Philosophy at the Waterford College.

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Notices to Correspondents, The Irish Harp and Farmers' Herald, Adelaide, 10 February 1872, p 4, http://nla.gov.au/nla.news-article224364814:

J. O'B. — The Father Murphy about whom you enquire was a Franciscan. He only remained in the diocese for a few weeks, and was dismissed by Dr. Shiel. Father O'Rourke, O.S.F., did offer himself to Dean Farrell as a volunteer for Protestantism. The Dean however, very wisely would have nothing to do with him, and ordered him to leave his house. Father Keating belonged to the Franciscan Order. He was dismissed from the diocese by the late Vicar-General during Dr. Shiel's absence. He lived in the Kapunda district, where it was intended to build a Franciscan monastery. The reasons for which he was dismissed by Father Smyth are well known, but we prefer not to mention them here. Father Horan belongs to the same order. We believe he is still attached to the Kapunda mission. For the rest consult an experienced theologian or a work on theology. It is better to keep such matters private for the present. Of course solemn vows bind for life, and the infringement of such laws is rendered much more culpable by the fact of the person being in orders.

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Fr T.J. Linane, From Abel to Zundolovich, Vol. 1, 1979, p 56: "O'Rourke, Peter OSF Cap. / Ir. /Adel. 1868."

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A Prayer-Calendar of Deceased Priests & Deacons in Australia 1788-2009, compiled by W.T. Southerwood, Sixth Edition, 2009, p 138: "Peter O'Rourke, OFMCap, Adelaide; only year of death known: 1868."

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Based on the information above, it seems that the listing in Linane, Vol 1, was interpreted by Fr Southerwood as indicating a date of death of 1868. It seems more likely that Fr Peter O'Rourke (if that was his first name) left the ministry in Adelaide about 1868 (Dean Farrell, Anglican, mentioned in the 1872 article above, left Adelaide in January 1869).