Beware different spelling "McIllquan"
Cwmystwyth 1896 to 1898 in partnership with Bainbridge and Boundy. Agent John Owen
William Boundy, owner north Bryyrafr and Camdwrbach (Mine of the black cave pearls Simon RL)
Same partnership as above: Owners of Castell Mine 1896, agent John Owen again.
James McIlquan and James Rawthorne owners of Dolclettwr 1881 to 1883. J Mac was agent as well
P Barker and James McIlquan owners of Esgairmwyn and Esgirddu 1886 to 1889
I am hitting more and more so what follows is a paste in
Glogfach & Glogfawr,,1893 - 1898,,Agent - Peter Garland,Secretary - James McIlquhan,
J.A. & Thomas Garland & James McIlquhan,,Owner / Operator / Lesee,,Lisburne = Glogfach & Glogfawr,,1899 - 1903,,Not Worked 1902 - 03;,,
John Jones Atwood & Co.,,Owner / Operator / Lesee,,Mountain Lake,,1862,,No Detailed Return,,
James McIlquhan & James Rawsthorne,,Owner / Operator / Lesee,,Llainhir,,1881,,Manager - Evan Daniel,,
Rhoswydol Mining Co. Ltd.,,Owner / Operator / Lesee,,Rhoswydol including Bacheiddon 73+74;,,1873 - 1877 stopped 18 August 1877,,Manager: George Green 73-74;,Agent;J.H. Roberts 74;+Seth Dunn 75; S Dunn 76-77,Secretary: George Green 77;
Thomas W. Ward,,Scrapper ?,,Rhoswydol,,1890,,Agent; James McIlquhan,,
James McIlquhan & Co.,,Owners,,"Bwlch , Pencraigddu & Ceunant",,1885 - 1890,,Agent - William Northey 1881 - 1890.,,
Continuing database searches.
EDIT
Above is courtesy of Simon JS Hughes "captains" database, kindly provided for my use. Credit where its due.
My avatar is a poor likeness.