Construction of the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Seven_Sisters_Colliery" id="mwkw" rel="mw:WikiLink" title="Seven Sisters Colliery">Seven Sisters Colliery</a>, <a href="https://en.wikipedia.org/wiki/South_Wales" id="mwlA" rel="mw:WikiLink" title="South Wales">South Wales</a>, begins; it is located on one of the richest coal sources in Britain.<sup about="#mwt91" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-16"}}' id="cite_ref-16" rel="dc:references" typeof="mw:Extension/ref"><a href="./March_11#cite_note-16" id="mwlQ" style="counter-reset: mw-Ref 16;"><span class="mw-reflink-text" id="mwlg">[16]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-16"><cite about="#mwt88" class="citation web cs1" id="CITEREFTurner2016">Turner, Robin (7 May 2016). <a class="external text" href="https://www.walesonline.co.uk/lifestyle/fun-stuff/how-welsh-place-live-name-11278650" id="mwB0k" rel="mw:ExtLink nofollow">"This is how the Welsh place you live got its name"</a>. <i id="mwB0o"><a class="mw-redirect" href="./WalesOnline" id="mwB0s" rel="mw:WikiLink" title="WalesOnline">WalesOnline</a></i><span class="reference-accessdate" id="mwB0w">. Retrieved <span class="nowrap" id="mwB00">8 October</span> 2020</span>.</cite><span about="#mwt88" class="Z3988" id="mwB04" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=WalesOnline&amp;rft.atitle=This+is+how+the+Welsh+place+you+live+got+its+name&amp;rft.date=2016-05-07&amp;rft.aulast=Turner&amp;rft.aufirst=Robin&amp;rft_id=https%3A%2F%2Fwww.walesonline.co.uk%2Flifestyle%2Ffun-stuff%2Fhow-welsh-place-live-name-11278650&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMarch+11"></span></span>