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594:: during the following centuries almost all traces of this old centre disappeared and the valley was again completely covered by forests. From 1700, many and expensive efforts were done in order to find out the gold field where the precious metal came from but nobody managed to detect it.
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period, as answer to the embargo imposed by other nations on
Italian gold trade. Today this activity turned into a local popular hobby and a museum of gold extraction was founded in
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are only some of villages which were built around their own castles on top of rocky hills close to the river, surrounded by vineyard and woods.
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origin related with Celtic mythology and as toponym is often associated with rivers whose sand were found to be rich in gold.
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is the biggest town in Orba's valley, and it has a central role among all other villages on top of hills:
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Piano di Tutela delle Acque - Revisione del 1º luglio 2004; Caratterizzazione bacini idrografici
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Piano di Tutela delle Acque - Revisione del 1º luglio 2004; Caratterizzazione bacini idrografici
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In settanta alla camminata in ricordo delle 111 vittime del crollo della diga di Molare
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built from 1917 to 1925 on the Orba collapsed after a period of heavy rains in August
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is supposed to have been an important centre for gold extraction until the end of the
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Oro, miniere, storia: miscellanea di giacimentologia e storia mineraria italiana
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Torrente
Ammione, a right-hand tributary of the Orba
46:. Unsourced material may be challenged and removed.
422:Orba c. 70 km course runs northwards through
395:which is quite frequent in Europe, especially in
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881:This article related to a river in Italy is a
582:was extracted from Orba's sand long before the
699:(in Italian). Regione Piemonte. Archived from
662:(in Italian). Regione Piemonte. Archived from
407:in a variety of different forms and spelling.
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597:Gold extraction from sand grew up during the
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106:Learn how and when to remove this message
942:Rivers of the Metropolitan City of Genoa
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495:Wines produced in this valley include:
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586:founded a town in this forested area.
937:Rivers of the Province of Alessandria
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295:15.1 m/s (530 cu ft/s)
273:776.4 km (299.8 sq mi)
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835:This Piedmont location article is a
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756:- Alessandria» of 13 August 2015.
947:Rivers of the Province of Savona
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31:needs additional citations for
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224: • coordinates
1:
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434:) to its confluence with the
430:(from the northern slopes of
168:Physical characteristics
885:. You can help Knowledge by
839:. You can help Knowledge by
786:. You can help Knowledge by
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202:1,183 m (3,881 ft)
198: • elevation
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265:68.4 km (42.5 mi)
186: • location
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932:Tributaries of the Bormida
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690:AA.VV. "Elaborato I.c/7".
653:AA.VV. "Elaborato I.c/5".
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291: • average
724:Pipino, Giuseppe (2003).
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957:Rivers of the Apennines
782:location article is a
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454:and then it comes to
592:Western Roman Empire
40:improve this article
470:Tagliolo Monferrato
304:Basin features
242: /
614:Lago di Ortiglieto
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486:Castelletto d'Orba
246:44.8724°N 8.6169°E
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45:
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35:
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29:This article
27:
23:
18:
17:
887:expanding it
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841:expanding it
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731:. Retrieved
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701:the original
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325:Adriatic Sea
102:
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38:Please help
33:verification
30:
556:Left Bank:
432:Monte Reixa
331:Tributaries
309:Progression
249: /
191:Monte Reixa
926:Categories
733:2016-07-25
710:2016-04-19
673:2016-04-24
640:References
588:Rondinaria
562:Olbicella,
530:Carpescio,
525:Right Bank
458:'s hills.
456:Monferrato
270:Basin size
234:44°52′21″N
66:newspapers
754:La Stampa
610:reservoir
565:rio Meri,
559:Orbarina,
545:Albedosa,
482:Carpeneto
474:Cremolino
428:Apennines
418:Geography
282:Discharge
237:8°37′01″E
96:July 2016
628:See also
448:Tiglieto
424:Piedmont
384:Toponymy
374:torrente
153:Location
780:Liguria
603:Predosa
599:Fascist
575:History
568:Amione.
490:Predosa
442:of the
436:Bormida
393:toponym
370:Italian
366:torrent
313:Bormida
217:Bormida
158:Country
80:scholar
624:area.
612:named
584:Romans
452:Molare
412:Celtic
401:France
334:
317:Tanaro
285:
262:Length
180:
177:Source
137:Molare
82:
75:
68:
61:
53:
778:This
704:(PDF)
697:(PDF)
667:(PDF)
660:(PDF)
622:Ovada
549:Lemme
540:Piota
462:Ovada
405:Spain
397:Italy
391:is a
378:Italy
364:is a
353:Lemme
349:Piota
212:Mouth
162:Italy
87:JSTOR
73:books
883:stub
837:stub
784:stub
618:1935
580:Gold
438:, a
403:and
389:Orba
362:Orba
360:The
124:Orba
59:news
42:by
928::
682:^
608:A
527::
507:.
503:,
499:,
488:,
484:,
480:,
476:,
472:,
468:,
450:,
444:Po
399:,
380:.
372::
351:,
347:,
323:→
321:Po
319:→
315:→
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900:v
889:.
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736:.
713:.
676:.
551:.
542:,
536:,
368:(
109:)
103:(
98:)
94:(
84:·
77:·
70:·
63:·
36:.
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