Tratado das Plantas Medicinais – Telma Grandi

O Tratado de Plantas Medicinais (Mineiras, Nativas e Cultivadas) publicado pela Prof.ª Telma Grandi está disponível para download aqui: Tratado das Plantas Medicinais Mineiras ou através da página CicloVivo (onde esta notícia está detalhada).

O “Tratado das Plantas Medicinais” é fruto do trabalho de mais de 40 anos de pesquisas e vivências da farmacêutica e professora Telma Sueli Mesquita Grandi. A obra, disponível para download gratuito, reúne 383 espécies com poder medicinal. …

Boa parte dos exemplares estudados e apresentados foram coletados em Minas Gerais. Mas, são nativos de diferentes locais do mundo e comuns em diversas regiões brasileiras.

in CicloVivo

Nota: Mineiras: originárias de Minas Gerais.

USGS – Volcanogenic Massive Sulfide Occurrence Model

The USGS is an invaluable source of knowledge and information on economic geology (and on most Geology branches, in fact). I have just come across one of their publications; in this case, on VMS deposits – an important source of precious and basic metals (in the world and in Portugal – in our case, for over two millennia). Enjoy: Volcanogenic Massive Sulfide Occurrence Model.


There is not a final casualty number arising from the failure of two tailings’ dams of the Alegria iron mine. The mine, owned by SAMARCO – a BHP and VALE joint venture, is located in the region of Mariana – Ouro Preto (Minas Gerais, Brazil). Workers at the site are reported dead or missing (some sources refer one confirmed dead, 13 missing). Bento Rodrigues and other localities downstream of the accident were flooded by mud – there still is no information on victims there (images from these sites suggest likely human casualties).
The effort and attention is now directed to help those affected by this accident and to assess its full impact. The material released to the affected hydrographic basin is mostly composed by silica, a inert material according to SAMARCO’s latest report.  Minuto Mais published aerial footage of the affected area in their Facebook page.
There is no explanation for the failure of the dams, SAMARCO’s worst crisis – SAMARCO’s CEO quoted in Valor Econômico, a Brazilian publication. SAMARCO issued two reports; VALE and BHP issued statements (VALE; BHP).
The accident has been widely reported in international specialised – Mining Journal – and economic media – Financial Times and Wall Street Journal.

The source of diamonds in the Diamantina (Minas Gerais) region: Fm. Sopa – Brumadinho

Conglomerado Sopa (Sopa – Guida outcrop)

The precambrian Sopa Conglomerate is the source for modern alluvial diamonds deposits in the Diamantina (Minas Gerais) region. This old secondary formation is being reworked by the rivers in the area, releasing the diamonds it stores (themselves originated in primary, still unidentified, sources) into modern alluvia. Both the old conglomerate (Fm. Sopa – Brumadinho – Espinhaço Supergroup, Middle Proterozoic) and modern alluvia have been mined for diamonds since the early XVIII century in the region, in the process giving birth to diamond’s Modern Era.

Several outcrops may be visited in the area: the pictures I have included in the photo gallery are from Lavrinha (Campo de Sopa – Guinda), a short travel from Diamantina. Many other outcrops are visible in the region.

You may also read the geological site description (in Portuguese, just an English abstract) in an article by Mário Chaves and Ítalo Meneghetti Filho available here: sitio036.

A mineral treasure trove in Goiás (GO) and Minas Gerais (MG) – BRAZIL

Serra do Espinhaço (Minas gerais - MG) - from Diamantina to Carvel, on the way to Belo Horizonte.
Serra do Espinhaço (Minas Gerais – MG) – from Diamantina to Curvelo, on the way to Belo Horizonte.

I have been in Goiás (GO) and Minas Gerais (MG) – Brazil in the last two weeks. It is a land of mineral opportunities – in a couple of days I visited manganese, iron, emerald, gold, nickel, diamond, aggregates and limestone deposits and prospects. It was the ideal road trip: looking for mineral deposits, in Brazil – my home away from home, with friends – old and new. Can you ask for more?

Curious? The photo gallery can be seen here.

Goiás and Minas Gerais 2015 road trip – emerald, specularite, manganese and diamond deposits

Returning from Campos Verdes emerald deposits
Returning from Campos Verdes emerald deposits

Diamonds in the Chapada Diamantina – Bahia, Brazil

Just before starting a new trip to Brazil (into manganese mineral deposits in Goiás and Minas Gerais), this is a new photogallery for a 2004 road trip aimed at learning about the Bahia diamond deposits (geology, formation, history, social and natural settings). Of course, it was just the perfect pretext for four old friends getting into another Brazilian road trip. It took us from Diamantina (Minas Gerais) to Andaraí and Lencóis (Bahia).
I just hope the new trip’s photos won’t take 10 years to be published…
Brasil Diamantina Andarai Lençois 2004 03 097

Goldman Small Cap Research investment report on Brazil Minerals (gold and diamonds)

Brazil Minerals, Inc. (OTCQB: BMIX), a U.S. holding company with revenues from gold and diamonds, announced that Goldman Small Cap Research had issued an investment report on BMIX. The report can be accessed here (from our repository) or at Brazil Minerals’ website.



Diamonds from Diamantina – MG, Brazil

A rare feature – hexagonal pitting

Diamonds occur in many colours, shapes, sizes and transparencies. Sometimes they just look like sand (well, expensive, very expensive sand, as a lowly 10 USD/carat stone is worth more than gold – currently hovering 1.200 USD/oz); or else diamonds may be broken (chips), dotted in the inside with other minerals, eroded or pitted at the surface, colourless, slightly tinted or, rarely, fancy (marked tints).

The rough diamonds in this parcel are from the Diamantina region (Jequitinhonha river) in Minas Gerais (Brazil). This is an historic diamond district, originally found and discovered in the early 17th century during Brazil’s colonial period. Diamonds in the area tend to have a greyish tint; alas, this is not their body color (as they would be extremely rare and expensive), just the color of a shallow coating probably due to radiation.

This photo illustrates a rare diamond feature caught by chance on camera. Note the focused diamond on the right hand side; it has a triangular shape (locally know has chapéu de frade). On the center of the diamond there is a depression of rare hexagonal shape, unlike trigons diamond’s characteristic inverted pyramidal pits.