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Name:Mynydd y Grug
Hill number:5273
Height:349m / 1145ft
Parent (Ma):2297  Mynydd Machen
RHB Section:32C: Neath to Chepstow
County/UA:Caerphilly
Catchment:Rhymney, Catchment Boundaries, Usk
Watershed:Cardiff to Cape Wrath
Class:Tump (300-399m), Subhump, Clem
(Tu,3,sHu,Cm)
Grid ref:ST 17684 90939
Summit feature:edge of track on NE side of tip
Drop:98m
Col:250.6m  ST 1988 9033  
OS map sheet(s):(1:50k) 171
(1:25k) 166E
Observations:highest point of tip marked by a few rocks at ST 17760 90670
Comments:Spoil heap (374m) covers natural summit. See Database Notes.
Change log:show changes for this hill entry
GPS data:show GPS entries for this hill

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N.B. Some hill summits are on private property or on land where there is no public right of way.  Permission should be sought from the landowner where access to a hill summit is through private land.
Please report via the contact page any logs you see below which describe or encourage acts of trespass.  Please quote the hill number and hill name.

Logged Descriptions  (logged by 83 users, only the latest 50 shown - Show all)ByDate of Ascent
AM walk with Peggy 6mdavecnash26/01/2024
This is a hump; the official summit coordinates (ST 17684 90939) have become irrelevant.Matt02/05/2023
From road head along rocky track, some flytipping. Across mine spoil to a flat summit. Area slowly being colonised by trees. Great views.cjo29/06/2022
Cracking run from Bedwas … ran around top for a bit to make sure … not the prettiest top and now demotedmilejunkie08/02/2022
On a sunny, solo walk from the Sirhowy valley below Wyllie, after visiting the many Bronze Age cairns at Mynydd Bach and Twyn Cae-Hugh. From the largest cairn, the landscape rises in a brown wilderness of shattered earth, up the unnatural slopes of the tip. Worth heading up to the highest part of the artificial area for the views, but not terrain to savour. From here I headed SE to the fine cairns at Twyn yr Oerfel, then on to Pen-rhiw Tip and Mynydd Machen.thesweetcheat30/01/2022
Definitely a bing with a smoothed bulldozed mine -spoil surface with ditches, possibly being prepared for tree planting. Dark and rainy but nice lights in valley. After Dimlaith via Rhymney valley Ridgeway walk.Denise 28/11/2021
An interesting world of rolled grey mud criss-crossed with drainage ditches. In darkness and dreek all a little surreal. From Mynydd Dimlaith, returning via the Mountain road then looping lane with good views of the lights of Caerphilly.RichardM28/11/2021
Owner of Pen-y-Waun OK with parking at end of lane at ST 16828 89994 - Up slabby track to junction at 171907 & then E. on good track to wide gateway at 174906 - Through gateway & up over 2 tracks of colliery spoil to the higher & much wider roadway - SE along roadway to 177905 & then up to the high point of the spoil heap (375m) which is being colonised by a mixture of grass, heather, gorse & spruce. Natural high point (355m) located somewhere to E, lies beneath metres of spoil. (S)gerrybowes07/10/2021
Start from football pitch in Trethomas, ascent over former Bedwas Colliery, tip and beyond to man-made summit of Mynydd Y Grug. Along Grug Common and descent via bridleway onto Mynydd Dimlaith, former railway line back to Trethomas.forsterfamily729/08/2021
mfrom bedwas church, mountain road and tip raining quiet todayunderhill18/06/2020
Bedwas to Risca. Very minimal vegetation amid the bare soil of the moulded summit cone.Smudge14/12/2019
07.30 the hump which is a moonscape mess & aspiring Marilyn since there is maturing pune forest up to above 370metres and there are full contour lines on the 1:25k map on this former coal slag heap.vegibagger22/07/2019
1/2 Parked just after cattle grid on road to west, pretty direct walk up through mud, fly tipping, and bikers. Not the most pleasantpenbet25/06/2019
Quiet midweek morning. Relatively easy to find the way to the top. Pleasant views, but perhaps won't live too long in the memory :)kasharic20/07/2018
From Bedwas, up Church Street then Mountain Road, then across sheep field to the fenceline, onto the spoil tip, up via the track on the western face, and on to the highest point, at the eastern end.Mariana Trench23/05/2018
TGIF because I guess at weekends the rubbish dumpers and the trailbikers are out in force. Drove to near masts to N, unmade road beyond too rough for my 2WD so ran from there. Enjoyed my 35 minson this hill, in the sunshine, but that was well enough. Fridge still there.pwheeler20/04/2018
Up from Bedwas. Grim - weather & hill.ngthack01/10/2017
Must've missed Nigel by just a few hours, though I was there at 3:30AM and it was probably even grimmer then. Quite an alien experience in the dark and mist actually.Alex C01/10/2017
Parked just beyond cattle grid. Horrible area, full of fly-tipped rubbish.liljonb22/01/2017
My last top for the county / UA . Walked up Mountain Road and then on to spoil heap to HP. Good views, but not pleasantPeterD18/09/2016
from sirhowy park to eastdicky29/05/2016
Up mountain road from Bedwas. The summit was noisy with trail bikers.Chris Peart14/02/2016
From car park for Sirhowy Country Park. Pleasant walk up on track through woods to the slag heap summit.Cas-gwent12/02/2016
Walked up Mountain Road passed farm to Common and beyond.Dugswell203/07/2015
Up Mountain Road from Bedwas. No parking possible at farm. Highest point fairly obvious but probably temporaryColin Crawford03/07/2015
petey17/04/2015
From Activity Centre on forest tracks.rhalstead03/04/2015
Drive up from village of Machen below and park after cattle grill and head for slag heap at top is the top !Fergalh16/11/2014
A rough estimated date as to when I walked over the summit of Mynydd y Grug.morgs4mountains01/03/2014
this hill is entirely made by bulldozers. does it count? park at last street uphill in Bedwas. walk up Mountain Road to the top and over rough stuff to the spoil heap. Highest point is 376m at 176906arranc06/10/2013
Went on Rhymney Ridge walk with schooldramaticjk12309/07/2013
A despoiled and ugly hill due to it consisting of spoil from the coal industry. The hill has been parially landscaped, but a lot more work is need. It's also been (and is) ruined by 4x4 and scrambler bikes using the area as a playground. The trig point has long since disappeared (maybe buried under tons of spoil).jonglew08/12/2012
Disappointing lack of glass or bathroom furnishings. As slag heaps go, not bad.Martin R28/07/2011
Parked at 18609055 next to the usual heap of broken glass but the toilet seat has gone! Also as usual, two locals in car and van carried on along the rough track heading north to Pontllanfraith! Easy walk to top of spoil heap which is partially landscapedchriswatson20/05/2011
Parked at 195906. Followed track to N of hill then up across the wasteland. Came back more directly.chrisbien09/05/2011
Parked on the verge beside the road going up the hill from Bedwas - about 50 m before the track on the right. Track seems to be ancient right of way.Malcvolm06/03/2010
Parked on the broken glass and broken toiler seat by the cattle grid.clivevilla30/01/2010
the summit of this hill is possibly the uglyest in wales deviod of any plant life showing the signs of open cast mining with a bit of fly tippinghodder03/10/2008
Accessed by driving up from Machen to within 750m parking at cattle grid. Summit is a spoil heap with about 10 rocks marking highest point. Means Heather Mountain in English.Father Ted10/09/2008
tk from Pen-y-Waun to SW RHW17/08/2002
I first walked here when I lived in Graig-y-Rhacca. I used to walk everywhere in wellies and a track-suit!PhylipSollis28/07/1979
alda24/03/2024
AlanD09/09/2023
asbown23/01/2022
TedCymru16/09/2021
abbo000114/07/2021
Tricky17/06/2021
Richie Towey05/08/2019
PGCE17/07/2019
outlawcatcher10/10/2018