The mining sector is one of the biggest on the ASX, making up around a quarter of the All Ordinaries Index (ASX: XAO). And with hundreds of ASX mining stocks to choose from, there's bound to be a winner out there for every type of investor.

But, as with any investment, most people, likely including these directors, buy in because they believe their purchase will provide returns.

So, without further ado, let's dive into three ASX mining shares that insiders have been snapping up.

3 ASX mining shares bought by insiders recently

Syrah Resources Ltd (ASX: SYR)

The first ASX mining share seeing insider buying lately is Syrah Resources.

The company's chair, Jim Askew, snapped up 200,000 shares on the market last week, paying 91 cents apiece to do so.

That saw the director forking out a total of $182,000 to bolster his total indirect holding in the graphite producer to more than 700,000 stocks.

So far that's been a good buy. The Syrah share price is currently 92 cents ­– leaving Askew with a 1% return so far.

Nova Minerals Ltd (ASX: NVA)

There was also director buying action over at gold and lithium explorer Nova Minerals. Director Craig Bentley indirectly purchased 300,000 shares in the ASX mining company on market last week.

The insider paid a total of nearly $105,000 for the stake – around 35 cents apiece.

That sees him holding approximately 1.2 million shares directly and another 2.5 million indirectly.

Sadly, the insider's most recent purchase has so far resulted in a loss. The Nova Minerals share price is trading at 32.5 cents right now.

Rumble Resources Ltd (ASX: RTR)

Finally, non-executive director of Rumble Resources Matthew Banks has bolstered his position in the metal explorer.

He purchased a little over 823,600 of the ASX mining company's shares on market over the course of two days last week, paying nearly $155,500 to do so.

That equates to 18.9 cents a share and sees the insider holding 3.25 million shares in the company directly and around 18.8 million indirectly.

Right now, the Rumble Resources share price is trading marginally above the purchase price, at 19 cents.

The post 3 ASX mining directors buying up their company shares appeared first on The Motley Fool Australia.

While some experts think the sector has now had its run, others are picking out individual ASX mining shares for their bright outlook.

Here are two such stocks:

'A vital role in the energy transition to renewables'

Bell Potter investment advisor Christopher Watt this week rated metals miner South32 Ltd (ASX: S32) as a buy.

"South32 is a diversified mining company with aluminium, alumina, manganese, nickel, silver and coal assets in Australia, South America and Africa," Watt told The Bull.

"These resources play a vital role in the energy transition to renewables."

He also sees the company cashing in on global themes of "global population growth, urbanisation and increasing demand for commodities". 

"South32 offers attractive fully franked dividends."

Indeed, the stock is currently paying out a whopping 8.94% dividend yield.

The share price has dropped sharply since early June, losing around 30%.

According to CMC Markets, more than 15 analysts are currently rating South32 as a strong buy, while just seven deem it a hold.

The stock is certainly generating much interest at the moment. Both on Friday and Monday, it was one of the heaviest-traded ASX shares.

'Attracting more attention'

Rumble Resources Ltd (ASX: RTR) is an ASX mining share investors don't hear much about, but Fat Prophets chief Angus Geddes is now rating it as a buy.

"Zinc and lead is attracting more attention, as Rumble Resources proves up its Earaheedy zinc-lead project in Western Australia.

"The latest drill results confirm the prospective nature of Earaheedy, with high-grade zinc-lead assays reported."

He added that "feeder zones" are likely to push up the future potential of the Earaheedy site.

"There's much more exploration ahead."

As an exploration business, Rumble does not pay out a dividend. Its share price is down more than 40% so far this year.

The post 2 ASX mining shares ready to rocket: experts appeared first on The Motley Fool Australia.