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{|class="infotable" style="clear:both;text-align:center!important;font-size:110%;min-width:80%;margin:0 auto"{Planets!style="width:1%"|'''Map'''!colspan="2"|'''Basic Data'''!style="width:1%"|'''Planetary Image'''|-|rowspan="9" style="padding:0"|[[File:{{{Map|Galaxy map unknown.jpg}}}|{{{Map Px|}}}px]]|'''Name:'''|'''Simia Orichalcae'''|rowspan="9" style="padding:0"|[[File:{{{Planetary Image|=Unknown.jpg}}}|Name={{{Planetary Image Px|200PAGENAME}}}px]]|-|'''[[Segmentum]]:'''|{{{Segmentum|=Unknown}}}|-|'''[[Sector]]:'''|{{{Sector|=Unknown}}}|-|'''[[Subsector]]:'''|{{{Subsector|=Unknown}}}|-|'''[[System]]:'''|{{{System|=Unknown}}}|-|'''[[Population]]:'''|{{{Population|=Unknown}}}|-|'''[[Affiliation]]:'''|{{{Affiliation|=[[Imperium]]}}}|-|'''[[Class (planet)|Class]]:'''|{{{Class|=[[Ice World]], /[[Mining World]], /[[Tomb World]]}}}|-|'''[[Tithe Grade]]:'''|{{{Tithe Grade|=Unknown}}}|-|}<noinclude> The planet of '''Simia Orichalcae''' is mainly an [[Ice World]], uninhabited except for [[Promethium]] processing plants scattered across the planet to refine veins of rare ice, deep underground, into usable promethium.{{Fn|1}} 

The origins of the planet's name remains unknown. After some research, the most plausible theory that [[Inquisitor]] [[Amberley Vail]] could produce was that, after some research, but is suspected to refer it refers to a statue or effigy in a past epoch, but the importance of commemorating the genus ''Simia'' remains unknown.{{Fn|1a}}

It is, however, most notably featured as the planet where [[Commissar]] [[Ciaphas Cain]] along with the [[Valhallan 597th]] were deployed to defend a promethium refinery against marauding bands of [[Orks]]{{Fn|1b}}, and later encountering [[Necrons]] released from stasis by the presence of sentient life.{{Fn|1c}}. It was later speculated that high-ranking [[Magos|Magi]] of the [[Adeptus Mechanicus]], had deliberately built the refinery above the Necron Tomb, in order to investigate it.{{Fn|1d}}

Commissar Cain attempted to destroy the Necron Tomb, along with a Necron warp portal [[Dolmen Gate]], with [[melta bombs]], but initially failed.{{Fn|1e}} In desperation, he filled the deep underground caverns beneath the processing plant with promethium from a reserve, with the help of Adeptus Mechanicus magus, Magos [[Logash]]; , and "got the frak out of there". {{Fn|1f}}

The [[Imperial Guard]], realizing that they could not defeat an endless wave of foes (noting that said foes were apparently indestructible without the help of an [[Astartes]] [[Chapter]]), on top of a wave of Orks being led by a [[Gargant]], promptly chose to evacuate the mining colonies to an awaiting ship, the ''Pure of Heart''. {{Fn|1g}}

From there, they detonated the promethium-filled caverns with bombs placed by sappers originally meant for the approaching Gargant. The blast was so powerful that shockwaves were felt throughout the already-spaceborne ''Pure of Heart'', and left a kilometers-wide crater that permanently scarred the pristine icy-beauty of Simia Orichalcae.{{Fn|1h}}

[[Ordo Xenos]] [[Inquisitor]] [[Amberley Vail]] later launched an investigation and, much to everybody's relief, found no evidence of any further Necron activity; although she privately admitted that she was none too keen to be the first to start digging holes to find out for sure.{{Fn|1i}}.

''Simia Orichalcae'' is Latin for "Brass Monkey". The expression [[wikipediaWikipedia:Brass monkey (colloquial expresssion)|"cold enough to freeze the [blank] off a brass monkey"]] is a common colloquialism in [[M2]].

**{{Endn|1a}}: Chapter 1, ppg. 295, fn. 1**{{Endn|1b}}: Chapter 1, pppgs. 295-298**{{Endn|1c}}: ChsChapters. 6, 9, 11, pppgs. 352-354, 390-393, 411-418**{{Endn|1d}}: Chapter 14, pppgs. 424-431**{{Endn|1e}}: Chapter 15, pppgs. 454-455**{{Endn|1f}}: Chapter 15, pppgs. 467-468**{{Endn|1g}}: Chapter 15, pppgs. 468-469**{{Endn|1h}}: Chapter 16, pppgs. 474-478**{{Endn|1h}}: Chapter 16, ppg. 478, fn. 1